Regex Match a character which is not followed by another specific character
I'm writing a CodeMirror extension for Brackets. To defineSimpleCodeMode I need to do some pattern matching and I'm trying to figure out how to achieve $subject.
e.g.
Match < of all the html tags
<body>
And ignore html tags which are followed by <%
<% if %>
Note: I only want to get the starting < of it
If some can help me out it would be a great help. Please do let me know if you need anymore details.
Thanks!
javascript regex
edited Dec 13 '18 at 8:40
Wiktor Stribiżew
325k16146226
asked Aug 10 '16 at 10:56
Jerad RutnamJerad Rutnam
1,0961825
add a comment |
I'm writing a CodeMirror extension for Brackets. To defineSimpleCodeMode I need to do some pattern matching and I'm trying to figure out how to achieve $subject.
e.g.
Match < of all the html tags
<body>
And ignore html tags which are followed by <%
<% if %>
Note: I only want to get the starting < of it
If some can help me out it would be a great help. Please do let me know if you need anymore details.
Thanks!
javascript regex
edited Dec 13 '18 at 8:40
Wiktor Stribiżew
325k16146226
asked Aug 10 '16 at 10:56
Jerad RutnamJerad Rutnam
1,0961825
3
using a regex to parse a template string, can be a very bad idea
– Daniel A. White
Aug 10 '16 at 10:57
Hi @DanielA.White this is to write an CodeMode extension.
– Jerad Rutnam
Aug 10 '16 at 10:58
add a comment |
I'm writing a CodeMirror extension for Brackets. To defineSimpleCodeMode I need to do some pattern matching and I'm trying to figure out how to achieve $subject.
e.g.
Match < of all the html tags
<body>
And ignore html tags which are followed by <%
<% if %>
Note: I only want to get the starting < of it
If some can help me out it would be a great help. Please do let me know if you need anymore details.
Thanks!
javascript regex
edited Dec 13 '18 at 8:40
Wiktor Stribiżew
325k16146226
asked Aug 10 '16 at 10:56
Jerad RutnamJerad Rutnam
1,0961825
I'm writing a CodeMirror extension for Brackets. To defineSimpleCodeMode I need to do some pattern matching and I'm trying to figure out how to achieve $subject.
e.g.
Match < of all the html tags
<body>
And ignore html tags which are followed by <%
<% if %>
Note: I only want to get the starting < of it
If some can help me out it would be a great help. Please do let me know if you need anymore details.
Thanks!
javascript regex
javascript regex
edited Dec 13 '18 at 8:40
Wiktor Stribiżew
325k16146226
asked Aug 10 '16 at 10:56
Jerad RutnamJerad Rutnam
1,0961825
edited Dec 13 '18 at 8:40
Wiktor Stribiżew
325k16146226
asked Aug 10 '16 at 10:56
Jerad RutnamJerad Rutnam
1,0961825
edited Dec 13 '18 at 8:40
Wiktor Stribiżew
325k16146226
edited Dec 13 '18 at 8:40
Wiktor Stribiżew
325k16146226
edited Dec 13 '18 at 8:40
Wiktor Stribiżew
325k16146226
325k16146226
asked Aug 10 '16 at 10:56
Jerad RutnamJerad Rutnam
1,0961825
asked Aug 10 '16 at 10:56
Jerad RutnamJerad Rutnam
1,0961825
asked Aug 10 '16 at 10:56
Jerad RutnamJerad Rutnam
1,0961825
1,0961825
3
using a regex to parse a template string, can be a very bad idea
– Daniel A. White
Aug 10 '16 at 10:57
Hi @DanielA.White this is to write an CodeMode extension.
– Jerad Rutnam
Aug 10 '16 at 10:58
add a comment |
3
using a regex to parse a template string, can be a very bad idea
– Daniel A. White
Aug 10 '16 at 10:57
Hi @DanielA.White this is to write an CodeMode extension.
– Jerad Rutnam
Aug 10 '16 at 10:58
3
3
using a regex to parse a template string, can be a very bad idea
– Daniel A. White
Aug 10 '16 at 10:57
using a regex to parse a template string, can be a very bad idea
– Daniel A. White
Aug 10 '16 at 10:57
Hi @DanielA.White this is to write an CodeMode extension.
– Jerad Rutnam
Aug 10 '16 at 10:58
Hi @DanielA.White this is to write an CodeMode extension.
– Jerad Rutnam
Aug 10 '16 at 10:58
add a comment |
1 Answer
1
active
oldest
votes
While this seems to be a bad idea, I can see two ways of doing it :
1. Searching for < followed by anything but the % character, then ignoring it
(<)(?:[^%])
The [^] sequence allows you to search for anything but the following character.
The (?:) sequence is for non capturing groups.
2. (Better, if supported) Searching for input not followed by % with a negative lookahead
<(?!%)
The (?!) sequence succeeds if it doesn't match the following character, but is not captured.
If you also want to do it for %>, you can just "reverse" the first option :
(?:[^%])(>)
Or you need a negative lookbehind :
(careful here, the lookahead won't work as you need to go backwards)
(?<!%)>
answered Aug 10 '16 at 11:01
AzaghalAzaghal
245110
Hi @Baptiste, Thanks for the answer. It almost do what I wanted.How is it possible to ignore the second charater which is after<?
– Jerad Rutnam
Aug 10 '16 at 11:03
I don't know what tool you are working with, but you could just replace what you get with the$1variable with most of them.
– Azaghal
Aug 10 '16 at 11:06
Im using regex101.com.
– Jerad Rutnam
Aug 10 '16 at 11:11
@JeradRutnam what you you mean the second character? It's already ignoring the second%
– phuclv
Aug 10 '16 at 11:12
Can we add$1along with the match(<)[^%]somehow?
– Jerad Rutnam
Aug 10 '16 at 11:13
|
show 8 more comments
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1 Answer
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votes
1 Answer
1
active
oldest
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oldest
votes
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oldest
votes
While this seems to be a bad idea, I can see two ways of doing it :
1. Searching for < followed by anything but the % character, then ignoring it
(<)(?:[^%])
The [^] sequence allows you to search for anything but the following character.
The (?:) sequence is for non capturing groups.
2. (Better, if supported) Searching for input not followed by % with a negative lookahead
<(?!%)
The (?!) sequence succeeds if it doesn't match the following character, but is not captured.
If you also want to do it for %>, you can just "reverse" the first option :
(?:[^%])(>)
Or you need a negative lookbehind :
(careful here, the lookahead won't work as you need to go backwards)
(?<!%)>
answered Aug 10 '16 at 11:01
AzaghalAzaghal
245110
Hi @Baptiste, Thanks for the answer. It almost do what I wanted.How is it possible to ignore the second charater which is after<?
– Jerad Rutnam
Aug 10 '16 at 11:03
I don't know what tool you are working with, but you could just replace what you get with the$1variable with most of them.
– Azaghal
Aug 10 '16 at 11:06
Im using regex101.com.
– Jerad Rutnam
Aug 10 '16 at 11:11
@JeradRutnam what you you mean the second character? It's already ignoring the second%
– phuclv
Aug 10 '16 at 11:12
Can we add$1along with the match(<)[^%]somehow?
– Jerad Rutnam
Aug 10 '16 at 11:13
|
show 8 more comments
While this seems to be a bad idea, I can see two ways of doing it :
1. Searching for < followed by anything but the % character, then ignoring it
(<)(?:[^%])
The [^] sequence allows you to search for anything but the following character.
The (?:) sequence is for non capturing groups.
2. (Better, if supported) Searching for input not followed by % with a negative lookahead
<(?!%)
The (?!) sequence succeeds if it doesn't match the following character, but is not captured.
If you also want to do it for %>, you can just "reverse" the first option :
(?:[^%])(>)
Or you need a negative lookbehind :
(careful here, the lookahead won't work as you need to go backwards)
(?<!%)>
answered Aug 10 '16 at 11:01
AzaghalAzaghal
245110
Hi @Baptiste, Thanks for the answer. It almost do what I wanted.How is it possible to ignore the second charater which is after<?
– Jerad Rutnam
Aug 10 '16 at 11:03
I don't know what tool you are working with, but you could just replace what you get with the$1variable with most of them.
– Azaghal
Aug 10 '16 at 11:06
Im using regex101.com.
– Jerad Rutnam
Aug 10 '16 at 11:11
@JeradRutnam what you you mean the second character? It's already ignoring the second%
– phuclv
Aug 10 '16 at 11:12
Can we add$1along with the match(<)[^%]somehow?
– Jerad Rutnam
Aug 10 '16 at 11:13
|
show 8 more comments
While this seems to be a bad idea, I can see two ways of doing it :
1. Searching for < followed by anything but the % character, then ignoring it
(<)(?:[^%])
The [^] sequence allows you to search for anything but the following character.
The (?:) sequence is for non capturing groups.
2. (Better, if supported) Searching for input not followed by % with a negative lookahead
<(?!%)
The (?!) sequence succeeds if it doesn't match the following character, but is not captured.
If you also want to do it for %>, you can just "reverse" the first option :
(?:[^%])(>)
Or you need a negative lookbehind :
(careful here, the lookahead won't work as you need to go backwards)
(?<!%)>
answered Aug 10 '16 at 11:01
AzaghalAzaghal
245110
While this seems to be a bad idea, I can see two ways of doing it :
1. Searching for < followed by anything but the % character, then ignoring it
(<)(?:[^%])
The [^] sequence allows you to search for anything but the following character.
The (?:) sequence is for non capturing groups.
2. (Better, if supported) Searching for input not followed by % with a negative lookahead
<(?!%)
The (?!) sequence succeeds if it doesn't match the following character, but is not captured.
If you also want to do it for %>, you can just "reverse" the first option :
(?:[^%])(>)
Or you need a negative lookbehind :
(careful here, the lookahead won't work as you need to go backwards)
(?<!%)>
answered Aug 10 '16 at 11:01
AzaghalAzaghal
245110
edited Aug 10 '16 at 12:27
answered Aug 10 '16 at 11:01
AzaghalAzaghal
245110
answered Aug 10 '16 at 11:01
AzaghalAzaghal
245110
answered Aug 10 '16 at 11:01
AzaghalAzaghal
245110
245110
Hi @Baptiste, Thanks for the answer. It almost do what I wanted.How is it possible to ignore the second charater which is after<?
– Jerad Rutnam
Aug 10 '16 at 11:03
I don't know what tool you are working with, but you could just replace what you get with the$1variable with most of them.
– Azaghal
Aug 10 '16 at 11:06
Im using regex101.com.
– Jerad Rutnam
Aug 10 '16 at 11:11
@JeradRutnam what you you mean the second character? It's already ignoring the second%
– phuclv
Aug 10 '16 at 11:12
Can we add$1along with the match(<)[^%]somehow?
– Jerad Rutnam
Aug 10 '16 at 11:13
|
show 8 more comments
Hi @Baptiste, Thanks for the answer. It almost do what I wanted.How is it possible to ignore the second charater which is after<?
– Jerad Rutnam
Aug 10 '16 at 11:03
I don't know what tool you are working with, but you could just replace what you get with the$1variable with most of them.
– Azaghal
Aug 10 '16 at 11:06
Im using regex101.com.
– Jerad Rutnam
Aug 10 '16 at 11:11
@JeradRutnam what you you mean the second character? It's already ignoring the second%
– phuclv
Aug 10 '16 at 11:12
Can we add$1along with the match(<)[^%]somehow?
– Jerad Rutnam
Aug 10 '16 at 11:13
Hi @Baptiste, Thanks for the answer. It almost do what I wanted.How is it possible to ignore the second charater which is after
< ?– Jerad Rutnam
Aug 10 '16 at 11:03
Hi @Baptiste, Thanks for the answer. It almost do what I wanted.How is it possible to ignore the second charater which is after
< ?– Jerad Rutnam
Aug 10 '16 at 11:03
I don't know what tool you are working with, but you could just replace what you get with the
$1 variable with most of them.– Azaghal
Aug 10 '16 at 11:06
I don't know what tool you are working with, but you could just replace what you get with the
$1 variable with most of them.– Azaghal
Aug 10 '16 at 11:06
Im using regex101.com.
– Jerad Rutnam
Aug 10 '16 at 11:11
Im using regex101.com.
– Jerad Rutnam
Aug 10 '16 at 11:11
@JeradRutnam what you you mean the second character? It's already ignoring the second
%– phuclv
Aug 10 '16 at 11:12
@JeradRutnam what you you mean the second character? It's already ignoring the second
%– phuclv
Aug 10 '16 at 11:12
Can we add
$1 along with the match (<)[^%] somehow?– Jerad Rutnam
Aug 10 '16 at 11:13
Can we add
$1 along with the match (<)[^%] somehow?– Jerad Rutnam
Aug 10 '16 at 11:13
|
show 8 more comments
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3
using a regex to parse a template string, can be a very bad idea
– Daniel A. White
Aug 10 '16 at 10:57
Hi @DanielA.White this is to write an CodeMode extension.
– Jerad Rutnam
Aug 10 '16 at 10:58