C# IndexOf, when word is part of another word, How to?

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let's say I have string "soak oak" and I want to have string index of ("oak"), it returns me the index of where "oak" starts in "soak" (1) but I want to find index of exact word "oak" (5), what do I need to do?

string text = "soak oak";

char seperators = {' ', '.', ',', '!', '?', ':',

        ';', '(', ')', 't', 'r', 'n', '"', '„', '“'};

string parts = text.Split(seperators,

                        StringSplitOptions.RemoveEmptyEntries);

text.IndexOf("oak"); // gets '1' because "oak" is in "soak"

                     // but I want to get 5 because of exact word "oak"

edited Nov 22 '18 at 11:40

Dmitry Bychenko

112k1099142

asked Nov 22 '18 at 10:56

GoodnightJess

255

2

You are searching inside the string text instead of the string parts.

– Peter B
Nov 22 '18 at 10:59

2

you're most of the way there... You've split the text by separators into parts. Now you just need to check if any of those parts are exactly "oak"

– James
Nov 22 '18 at 10:59

You need to implement an algorithm for it.Step 1. Push all characters into an array, Step 2. Check first letter of the array or letter after a space is starting with the keyword you are looking for. step 3: On start letter char match, loop for consecutive char to match the rest of the keywords. step 4: if all char match found then the first char index is your required ANSWER!!

– Pranesh Janarthanan
Nov 22 '18 at 11:08

You could make use of the System.Text.RegularExpression namespace. Here is an example of matching a whole word using Regex: regex101.com/r/7ijsEh/1 . You can then use Regex.Match(text, "boakb").Index. See here: dotnetfiddle.net/94XDQb

– DParry
Nov 22 '18 at 11:15

add a comment |

string text = "soak oak";

char seperators = {' ', '.', ',', '!', '?', ':',

        ';', '(', ')', 't', 'r', 'n', '"', '„', '“'};

string parts = text.Split(seperators,

                        StringSplitOptions.RemoveEmptyEntries);

text.IndexOf("oak"); // gets '1' because "oak" is in "soak"

                     // but I want to get 5 because of exact word "oak"

edited Nov 22 '18 at 11:40

Dmitry Bychenko

112k1099142

asked Nov 22 '18 at 10:56

GoodnightJess

255

2

You are searching inside the string text instead of the string parts.

– Peter B
Nov 22 '18 at 10:59

2

you're most of the way there... You've split the text by separators into parts. Now you just need to check if any of those parts are exactly "oak"

– James
Nov 22 '18 at 10:59

You need to implement an algorithm for it.Step 1. Push all characters into an array, Step 2. Check first letter of the array or letter after a space is starting with the keyword you are looking for. step 3: On start letter char match, loop for consecutive char to match the rest of the keywords. step 4: if all char match found then the first char index is your required ANSWER!!

– Pranesh Janarthanan
Nov 22 '18 at 11:08

You could make use of the System.Text.RegularExpression namespace. Here is an example of matching a whole word using Regex: regex101.com/r/7ijsEh/1 . You can then use Regex.Match(text, "boakb").Index. See here: dotnetfiddle.net/94XDQb

– DParry
Nov 22 '18 at 11:15

add a comment |

string text = "soak oak";

char seperators = {' ', '.', ',', '!', '?', ':',

        ';', '(', ')', 't', 'r', 'n', '"', '„', '“'};

string parts = text.Split(seperators,

                        StringSplitOptions.RemoveEmptyEntries);

text.IndexOf("oak"); // gets '1' because "oak" is in "soak"

                     // but I want to get 5 because of exact word "oak"

edited Nov 22 '18 at 11:40

Dmitry Bychenko

112k1099142

asked Nov 22 '18 at 10:56

GoodnightJess

255

string text = "soak oak";

char seperators = {' ', '.', ',', '!', '?', ':',

        ';', '(', ')', 't', 'r', 'n', '"', '„', '“'};

string parts = text.Split(seperators,

                        StringSplitOptions.RemoveEmptyEntries);

text.IndexOf("oak"); // gets '1' because "oak" is in "soak"

                     // but I want to get 5 because of exact word "oak"

c# string

edited Nov 22 '18 at 11:40

Dmitry Bychenko

112k1099142

asked Nov 22 '18 at 10:56

GoodnightJess

255

edited Nov 22 '18 at 11:40

Dmitry Bychenko

112k1099142

asked Nov 22 '18 at 10:56

GoodnightJess

255

edited Nov 22 '18 at 11:40

Dmitry Bychenko

112k1099142

edited Nov 22 '18 at 11:40

Dmitry Bychenko

112k1099142

edited Nov 22 '18 at 11:40

Dmitry Bychenko

112k1099142

asked Nov 22 '18 at 10:56

GoodnightJess

255

asked Nov 22 '18 at 10:56

GoodnightJess

255

asked Nov 22 '18 at 10:56

GoodnightJess

255

2

You are searching inside the string text instead of the string parts.

– Peter B
Nov 22 '18 at 10:59

2

you're most of the way there... You've split the text by separators into parts. Now you just need to check if any of those parts are exactly "oak"

– James
Nov 22 '18 at 10:59

You need to implement an algorithm for it.Step 1. Push all characters into an array, Step 2. Check first letter of the array or letter after a space is starting with the keyword you are looking for. step 3: On start letter char match, loop for consecutive char to match the rest of the keywords. step 4: if all char match found then the first char index is your required ANSWER!!

– Pranesh Janarthanan
Nov 22 '18 at 11:08

You could make use of the System.Text.RegularExpression namespace. Here is an example of matching a whole word using Regex: regex101.com/r/7ijsEh/1 . You can then use Regex.Match(text, "boakb").Index. See here: dotnetfiddle.net/94XDQb

– DParry
Nov 22 '18 at 11:15

add a comment |

2

You are searching inside the string text instead of the string parts.

– Peter B
Nov 22 '18 at 10:59

2

you're most of the way there... You've split the text by separators into parts. Now you just need to check if any of those parts are exactly "oak"

– James
Nov 22 '18 at 10:59

You need to implement an algorithm for it.Step 1. Push all characters into an array, Step 2. Check first letter of the array or letter after a space is starting with the keyword you are looking for. step 3: On start letter char match, loop for consecutive char to match the rest of the keywords. step 4: if all char match found then the first char index is your required ANSWER!!

– Pranesh Janarthanan
Nov 22 '18 at 11:08

You could make use of the System.Text.RegularExpression namespace. Here is an example of matching a whole word using Regex: regex101.com/r/7ijsEh/1 . You can then use Regex.Match(text, "boakb").Index. See here: dotnetfiddle.net/94XDQb

– DParry
Nov 22 '18 at 11:15

You are searching inside the string text instead of the string parts.

– Peter B
Nov 22 '18 at 10:59

you're most of the way there... You've split the text by separators into parts. Now you just need to check if any of those parts are exactly "oak"

– James
Nov 22 '18 at 10:59

You need to implement an algorithm for it.Step 1. Push all characters into an array, Step 2. Check first letter of the array or letter after a space is starting with the keyword you are looking for. step 3: On start letter char match, loop for consecutive char to match the rest of the keywords. step 4: if all char match found then the first char index is your required ANSWER!!

– Pranesh Janarthanan
Nov 22 '18 at 11:08

You could make use of the System.Text.RegularExpression namespace. Here is an example of matching a whole word using Regex: regex101.com/r/7ijsEh/1 . You can then use Regex.Match(text, "boakb").Index. See here: dotnetfiddle.net/94XDQb

– DParry
Nov 22 '18 at 11:15

add a comment |

6 Answers
6

active

oldest

votes

We can test indexes (IndexOf) in a loop:

static HashSet<char> s_Separtors = new HashSet<char>() {

  ' ', '.', ',', '!', '?', ':', ';', '(', ')', 't', 'r', 'n', '"', '„', '“'

};



private static int WordIndexOf(string source, string toFind) {

  if (string.IsNullOrEmpty(source) || string.IsNullOrEmpty(toFind))

    return -1;



  for (int index = source.IndexOf(toFind); 

       index >= 0; 

       index = source.IndexOf(toFind, index + 1)) {

    if (index < 0)

      return -1;



    if ((index == 0 || s_Separtors.Contains(source[index - 1])) &&

        (index >= source.Length - toFind.Length || 

         s_Separtors.Contains(source[index + toFind.Length])))

      return index;

  }



  return -1;

}

Demo:

// 5

Console.Write(WordIndexOf("soak oak", "oak"));

answered Nov 22 '18 at 11:11

Dmitry Bychenko

112k1099142

add a comment |

Regex approach

string text = "soak oak";

int result = Regex.Match(text, @"boakb").Index;

edited Nov 22 '18 at 12:17

answered Nov 22 '18 at 11:06

fubo

31.1k970107

1

or you could use "boakb", which looks for word boundaries

– Robin Bennett
Nov 22 '18 at 11:08

string text = "soak oak"; var match = Regex.Match(text, @"s[oak]"); if (match.Success) { Console.WriteLine(match.Index); // 4 }

– Aakarsh Dhawan
Nov 22 '18 at 11:14

string text = "I can see antoak." Expected: 13, actual: 0

– Dmitry Bychenko
Nov 22 '18 at 11:16

@RobinBennett thanks, I've updated my code to your suggestion

– fubo
Nov 22 '18 at 12:18

add a comment |

You may use below regex to find exact word in your string.

string text = "soak oak";

string searchText = "oak";

var index = Regex.Match(text, @"b" + Regex.Escape(searchText) + @"b").Index;

Output:

See the demo

edited Nov 22 '18 at 11:19

answered Nov 22 '18 at 11:12

er-sho

7,1402619

@"b" + Regex.Escape(searchText) + @"b" to be on the safe side

– Dmitry Bychenko
Nov 22 '18 at 11:18

@DmitryBychenko, thanks for improvement, answer updated :)

– er-sho
Nov 22 '18 at 11:19

add a comment |

You can use regular expressions, you may also find it useful to use word boundaries defined by regular expressions:

string text = "soak oak";

var pattern = @"boakb";

var regex = new Regex(pattern);

foreach(Match m in regex.Matches(text)){

    Console.WriteLine(m.Index);

    Console.WriteLine(m.Value);

}

answered Nov 22 '18 at 11:11

Muaz Othman

362313

add a comment |

You could find the string in your array by converting it to a list and using the IndexOf() method.

parts.ToList().IndexOf("oak");

That tells you which array item it is, rather than the index in the original string.

answered Nov 22 '18 at 11:12

Robin Bennett

1,925413

add a comment |

Another RegEx approach-

    string text = "soak oak";

    var match = Regex.Match(text, @"s[oak]");

    if (match.Success)

    {

        Console.WriteLine(match.Index); // 4

    }

s White space

Hope it helps.

answered Nov 22 '18 at 11:13

Aakarsh Dhawan

1196

[oak] is inccorect here: counter example is "a kao is not an oak"

– Dmitry Bychenko
Nov 22 '18 at 11:19

@DmitryBychenko Yes, you are correct. Thanks. How about this though, @"s(oak)"?

– Aakarsh Dhawan
Nov 22 '18 at 11:40

"oak" is a counter example for @"s(oak)": we don't want explicit s in the pattern; please, have a look at er-shoaib's answer

– Dmitry Bychenko
Nov 22 '18 at 11:42

add a comment |

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6 Answers
6

active

oldest

votes

6 Answers
6

active

oldest

votes

We can test indexes (IndexOf) in a loop:

static HashSet<char> s_Separtors = new HashSet<char>() {

  ' ', '.', ',', '!', '?', ':', ';', '(', ')', 't', 'r', 'n', '"', '„', '“'

};



private static int WordIndexOf(string source, string toFind) {

  if (string.IsNullOrEmpty(source) || string.IsNullOrEmpty(toFind))

    return -1;



  for (int index = source.IndexOf(toFind); 

       index >= 0; 

       index = source.IndexOf(toFind, index + 1)) {

    if (index < 0)

      return -1;



    if ((index == 0 || s_Separtors.Contains(source[index - 1])) &&

        (index >= source.Length - toFind.Length || 

         s_Separtors.Contains(source[index + toFind.Length])))

      return index;

  }



  return -1;

}

Demo:

// 5

Console.Write(WordIndexOf("soak oak", "oak"));

answered Nov 22 '18 at 11:11

Dmitry Bychenko

112k1099142

add a comment |

We can test indexes (IndexOf) in a loop:

static HashSet<char> s_Separtors = new HashSet<char>() {

  ' ', '.', ',', '!', '?', ':', ';', '(', ')', 't', 'r', 'n', '"', '„', '“'

};



private static int WordIndexOf(string source, string toFind) {

  if (string.IsNullOrEmpty(source) || string.IsNullOrEmpty(toFind))

    return -1;



  for (int index = source.IndexOf(toFind); 

       index >= 0; 

       index = source.IndexOf(toFind, index + 1)) {

    if (index < 0)

      return -1;



    if ((index == 0 || s_Separtors.Contains(source[index - 1])) &&

        (index >= source.Length - toFind.Length || 

         s_Separtors.Contains(source[index + toFind.Length])))

      return index;

  }



  return -1;

}

Demo:

// 5

Console.Write(WordIndexOf("soak oak", "oak"));

answered Nov 22 '18 at 11:11

Dmitry Bychenko

112k1099142

add a comment |

We can test indexes (IndexOf) in a loop:

static HashSet<char> s_Separtors = new HashSet<char>() {

  ' ', '.', ',', '!', '?', ':', ';', '(', ')', 't', 'r', 'n', '"', '„', '“'

};



private static int WordIndexOf(string source, string toFind) {

  if (string.IsNullOrEmpty(source) || string.IsNullOrEmpty(toFind))

    return -1;



  for (int index = source.IndexOf(toFind); 

       index >= 0; 

       index = source.IndexOf(toFind, index + 1)) {

    if (index < 0)

      return -1;



    if ((index == 0 || s_Separtors.Contains(source[index - 1])) &&

        (index >= source.Length - toFind.Length || 

         s_Separtors.Contains(source[index + toFind.Length])))

      return index;

  }



  return -1;

}

Demo:

// 5

Console.Write(WordIndexOf("soak oak", "oak"));

answered Nov 22 '18 at 11:11

Dmitry Bychenko

112k1099142

We can test indexes (IndexOf) in a loop:

static HashSet<char> s_Separtors = new HashSet<char>() {

  ' ', '.', ',', '!', '?', ':', ';', '(', ')', 't', 'r', 'n', '"', '„', '“'

};



private static int WordIndexOf(string source, string toFind) {

  if (string.IsNullOrEmpty(source) || string.IsNullOrEmpty(toFind))

    return -1;



  for (int index = source.IndexOf(toFind); 

       index >= 0; 

       index = source.IndexOf(toFind, index + 1)) {

    if (index < 0)

      return -1;



    if ((index == 0 || s_Separtors.Contains(source[index - 1])) &&

        (index >= source.Length - toFind.Length || 

         s_Separtors.Contains(source[index + toFind.Length])))

      return index;

  }



  return -1;

}

Demo:

// 5

Console.Write(WordIndexOf("soak oak", "oak"));

answered Nov 22 '18 at 11:11

Dmitry Bychenko

112k1099142

answered Nov 22 '18 at 11:11

Dmitry Bychenko

112k1099142

answered Nov 22 '18 at 11:11

Dmitry Bychenko

112k1099142

answered Nov 22 '18 at 11:11

Dmitry Bychenko

112k1099142

add a comment |

Regex approach

string text = "soak oak";

int result = Regex.Match(text, @"boakb").Index;

edited Nov 22 '18 at 12:17

answered Nov 22 '18 at 11:06

fubo

31.1k970107

1

or you could use "boakb", which looks for word boundaries

– Robin Bennett
Nov 22 '18 at 11:08

string text = "soak oak"; var match = Regex.Match(text, @"s[oak]"); if (match.Success) { Console.WriteLine(match.Index); // 4 }

– Aakarsh Dhawan
Nov 22 '18 at 11:14

string text = "I can see antoak." Expected: 13, actual: 0

– Dmitry Bychenko
Nov 22 '18 at 11:16

@RobinBennett thanks, I've updated my code to your suggestion

– fubo
Nov 22 '18 at 12:18

add a comment |

Regex approach

string text = "soak oak";

int result = Regex.Match(text, @"boakb").Index;

edited Nov 22 '18 at 12:17

answered Nov 22 '18 at 11:06

fubo

31.1k970107

1

or you could use "boakb", which looks for word boundaries

– Robin Bennett
Nov 22 '18 at 11:08

string text = "soak oak"; var match = Regex.Match(text, @"s[oak]"); if (match.Success) { Console.WriteLine(match.Index); // 4 }

– Aakarsh Dhawan
Nov 22 '18 at 11:14

string text = "I can see antoak." Expected: 13, actual: 0

– Dmitry Bychenko
Nov 22 '18 at 11:16

@RobinBennett thanks, I've updated my code to your suggestion

– fubo
Nov 22 '18 at 12:18

add a comment |

Regex approach

string text = "soak oak";

int result = Regex.Match(text, @"boakb").Index;

edited Nov 22 '18 at 12:17

answered Nov 22 '18 at 11:06

fubo

31.1k970107

Regex approach

string text = "soak oak";

int result = Regex.Match(text, @"boakb").Index;

edited Nov 22 '18 at 12:17

answered Nov 22 '18 at 11:06

fubo

31.1k970107

edited Nov 22 '18 at 12:17

answered Nov 22 '18 at 11:06

fubo

31.1k970107

answered Nov 22 '18 at 11:06

fubo

31.1k970107

answered Nov 22 '18 at 11:06

fubo

31.1k970107

1

or you could use "boakb", which looks for word boundaries

– Robin Bennett
Nov 22 '18 at 11:08

string text = "soak oak"; var match = Regex.Match(text, @"s[oak]"); if (match.Success) { Console.WriteLine(match.Index); // 4 }

– Aakarsh Dhawan
Nov 22 '18 at 11:14

string text = "I can see antoak." Expected: 13, actual: 0

– Dmitry Bychenko
Nov 22 '18 at 11:16

@RobinBennett thanks, I've updated my code to your suggestion

– fubo
Nov 22 '18 at 12:18

add a comment |

1

or you could use "boakb", which looks for word boundaries

– Robin Bennett
Nov 22 '18 at 11:08

string text = "soak oak"; var match = Regex.Match(text, @"s[oak]"); if (match.Success) { Console.WriteLine(match.Index); // 4 }

– Aakarsh Dhawan
Nov 22 '18 at 11:14

string text = "I can see antoak." Expected: 13, actual: 0

– Dmitry Bychenko
Nov 22 '18 at 11:16

@RobinBennett thanks, I've updated my code to your suggestion

– fubo
Nov 22 '18 at 12:18

or you could use "boakb", which looks for word boundaries

– Robin Bennett
Nov 22 '18 at 11:08

string text = "soak oak"; var match = Regex.Match(text, @"s[oak]"); if (match.Success) { Console.WriteLine(match.Index); // 4 }

– Aakarsh Dhawan
Nov 22 '18 at 11:14

string text = "I can see antoak." Expected: 13, actual: 0

– Dmitry Bychenko
Nov 22 '18 at 11:16

@RobinBennett thanks, I've updated my code to your suggestion

– fubo
Nov 22 '18 at 12:18

add a comment |

You may use below regex to find exact word in your string.

string text = "soak oak";

string searchText = "oak";

var index = Regex.Match(text, @"b" + Regex.Escape(searchText) + @"b").Index;

Output:

See the demo

edited Nov 22 '18 at 11:19

answered Nov 22 '18 at 11:12

er-sho

7,1402619

@"b" + Regex.Escape(searchText) + @"b" to be on the safe side

– Dmitry Bychenko
Nov 22 '18 at 11:18

@DmitryBychenko, thanks for improvement, answer updated :)

– er-sho
Nov 22 '18 at 11:19

add a comment |

You may use below regex to find exact word in your string.

string text = "soak oak";

string searchText = "oak";

var index = Regex.Match(text, @"b" + Regex.Escape(searchText) + @"b").Index;

Output:

See the demo

edited Nov 22 '18 at 11:19

answered Nov 22 '18 at 11:12

er-sho

7,1402619

@"b" + Regex.Escape(searchText) + @"b" to be on the safe side

– Dmitry Bychenko
Nov 22 '18 at 11:18

@DmitryBychenko, thanks for improvement, answer updated :)

– er-sho
Nov 22 '18 at 11:19

add a comment |

You may use below regex to find exact word in your string.

string text = "soak oak";

string searchText = "oak";

var index = Regex.Match(text, @"b" + Regex.Escape(searchText) + @"b").Index;

Output:

See the demo

edited Nov 22 '18 at 11:19

answered Nov 22 '18 at 11:12

er-sho

7,1402619

You may use below regex to find exact word in your string.

string text = "soak oak";

string searchText = "oak";

var index = Regex.Match(text, @"b" + Regex.Escape(searchText) + @"b").Index;

Output:

See the demo

edited Nov 22 '18 at 11:19

answered Nov 22 '18 at 11:12

er-sho

7,1402619

edited Nov 22 '18 at 11:19

answered Nov 22 '18 at 11:12

er-sho

7,1402619

answered Nov 22 '18 at 11:12

er-sho

7,1402619

answered Nov 22 '18 at 11:12

er-sho

7,1402619

@"b" + Regex.Escape(searchText) + @"b" to be on the safe side

– Dmitry Bychenko
Nov 22 '18 at 11:18

@DmitryBychenko, thanks for improvement, answer updated :)

– er-sho
Nov 22 '18 at 11:19

add a comment |

@"b" + Regex.Escape(searchText) + @"b" to be on the safe side

– Dmitry Bychenko
Nov 22 '18 at 11:18

@DmitryBychenko, thanks for improvement, answer updated :)

– er-sho
Nov 22 '18 at 11:19

@"b" + Regex.Escape(searchText) + @"b" to be on the safe side

– Dmitry Bychenko
Nov 22 '18 at 11:18

@DmitryBychenko, thanks for improvement, answer updated :)

– er-sho
Nov 22 '18 at 11:19

add a comment |

You can use regular expressions, you may also find it useful to use word boundaries defined by regular expressions:

string text = "soak oak";

var pattern = @"boakb";

var regex = new Regex(pattern);

foreach(Match m in regex.Matches(text)){

    Console.WriteLine(m.Index);

    Console.WriteLine(m.Value);

}

answered Nov 22 '18 at 11:11

Muaz Othman

362313

add a comment |

You can use regular expressions, you may also find it useful to use word boundaries defined by regular expressions:

string text = "soak oak";

var pattern = @"boakb";

var regex = new Regex(pattern);

foreach(Match m in regex.Matches(text)){

    Console.WriteLine(m.Index);

    Console.WriteLine(m.Value);

}

answered Nov 22 '18 at 11:11

Muaz Othman

362313

add a comment |

You can use regular expressions, you may also find it useful to use word boundaries defined by regular expressions:

string text = "soak oak";

var pattern = @"boakb";

var regex = new Regex(pattern);

foreach(Match m in regex.Matches(text)){

    Console.WriteLine(m.Index);

    Console.WriteLine(m.Value);

}

answered Nov 22 '18 at 11:11

Muaz Othman

362313

You can use regular expressions, you may also find it useful to use word boundaries defined by regular expressions:

string text = "soak oak";

var pattern = @"boakb";

var regex = new Regex(pattern);

foreach(Match m in regex.Matches(text)){

    Console.WriteLine(m.Index);

    Console.WriteLine(m.Value);

}

answered Nov 22 '18 at 11:11

Muaz Othman

362313

answered Nov 22 '18 at 11:11

Muaz Othman

362313

answered Nov 22 '18 at 11:11

Muaz Othman

362313

answered Nov 22 '18 at 11:11

Muaz Othman

362313

add a comment |

You could find the string in your array by converting it to a list and using the IndexOf() method.

parts.ToList().IndexOf("oak");

That tells you which array item it is, rather than the index in the original string.

answered Nov 22 '18 at 11:12

Robin Bennett

1,925413

add a comment |

You could find the string in your array by converting it to a list and using the IndexOf() method.

parts.ToList().IndexOf("oak");

That tells you which array item it is, rather than the index in the original string.

answered Nov 22 '18 at 11:12

Robin Bennett

1,925413

add a comment |

You could find the string in your array by converting it to a list and using the IndexOf() method.

parts.ToList().IndexOf("oak");

That tells you which array item it is, rather than the index in the original string.

answered Nov 22 '18 at 11:12

Robin Bennett

1,925413

You could find the string in your array by converting it to a list and using the IndexOf() method.

parts.ToList().IndexOf("oak");

That tells you which array item it is, rather than the index in the original string.

answered Nov 22 '18 at 11:12

Robin Bennett

1,925413

answered Nov 22 '18 at 11:12

Robin Bennett

1,925413

answered Nov 22 '18 at 11:12

Robin Bennett

1,925413

answered Nov 22 '18 at 11:12

Robin Bennett

1,925413

add a comment |

Another RegEx approach-

    string text = "soak oak";

    var match = Regex.Match(text, @"s[oak]");

    if (match.Success)

    {

        Console.WriteLine(match.Index); // 4

    }

s White space

Hope it helps.

answered Nov 22 '18 at 11:13

Aakarsh Dhawan

1196

[oak] is inccorect here: counter example is "a kao is not an oak"

– Dmitry Bychenko
Nov 22 '18 at 11:19

@DmitryBychenko Yes, you are correct. Thanks. How about this though, @"s(oak)"?

– Aakarsh Dhawan
Nov 22 '18 at 11:40

"oak" is a counter example for @"s(oak)": we don't want explicit s in the pattern; please, have a look at er-shoaib's answer

– Dmitry Bychenko
Nov 22 '18 at 11:42

add a comment |

Another RegEx approach-

    string text = "soak oak";

    var match = Regex.Match(text, @"s[oak]");

    if (match.Success)

    {

        Console.WriteLine(match.Index); // 4

    }

s White space

Hope it helps.

answered Nov 22 '18 at 11:13

Aakarsh Dhawan

1196

[oak] is inccorect here: counter example is "a kao is not an oak"

– Dmitry Bychenko
Nov 22 '18 at 11:19

@DmitryBychenko Yes, you are correct. Thanks. How about this though, @"s(oak)"?

– Aakarsh Dhawan
Nov 22 '18 at 11:40

"oak" is a counter example for @"s(oak)": we don't want explicit s in the pattern; please, have a look at er-shoaib's answer

– Dmitry Bychenko
Nov 22 '18 at 11:42

add a comment |

Another RegEx approach-

    string text = "soak oak";

    var match = Regex.Match(text, @"s[oak]");

    if (match.Success)

    {

        Console.WriteLine(match.Index); // 4

    }

s White space

Hope it helps.

answered Nov 22 '18 at 11:13

Aakarsh Dhawan

1196

Another RegEx approach-

    string text = "soak oak";

    var match = Regex.Match(text, @"s[oak]");

    if (match.Success)

    {

        Console.WriteLine(match.Index); // 4

    }

s White space

Hope it helps.

answered Nov 22 '18 at 11:13

Aakarsh Dhawan

1196

answered Nov 22 '18 at 11:13

Aakarsh Dhawan

1196

answered Nov 22 '18 at 11:13

Aakarsh Dhawan

1196

answered Nov 22 '18 at 11:13

Aakarsh Dhawan

1196

[oak] is inccorect here: counter example is "a kao is not an oak"

– Dmitry Bychenko
Nov 22 '18 at 11:19

@DmitryBychenko Yes, you are correct. Thanks. How about this though, @"s(oak)"?

– Aakarsh Dhawan
Nov 22 '18 at 11:40

"oak" is a counter example for @"s(oak)": we don't want explicit s in the pattern; please, have a look at er-shoaib's answer

– Dmitry Bychenko
Nov 22 '18 at 11:42

add a comment |

[oak] is inccorect here: counter example is "a kao is not an oak"

– Dmitry Bychenko
Nov 22 '18 at 11:19

@DmitryBychenko Yes, you are correct. Thanks. How about this though, @"s(oak)"?

– Aakarsh Dhawan
Nov 22 '18 at 11:40

"oak" is a counter example for @"s(oak)": we don't want explicit s in the pattern; please, have a look at er-shoaib's answer

– Dmitry Bychenko
Nov 22 '18 at 11:42

[oak] is inccorect here: counter example is "a kao is not an oak"

– Dmitry Bychenko
Nov 22 '18 at 11:19

@DmitryBychenko Yes, you are correct. Thanks. How about this though, @"s(oak)"?

– Aakarsh Dhawan
Nov 22 '18 at 11:40

"oak" is a counter example for @"s(oak)": we don't want explicit s in the pattern; please, have a look at er-shoaib's answer

– Dmitry Bychenko
Nov 22 '18 at 11:42

add a comment |

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