Python re.split and re.findall: grouping and capturing












3














I have strings like "00:00:00 Segment 1 00:20:00 Segment 2 8:00:00 Segment 3" and "00:00 Segment 1 20:0 Segment 2" and want to use re.split() and re.findall() to find all the timestamps and segment names. But I am having problem to achieve optional group without the capturing effect. Here are what I got:



str_1 = "00:00:00 Segment 1 00:20:00 Segment 2 8:00:00 Segment 3"
str_2 = "00:00 Segment 1 20:0 Segment 2"

re.findall(r'dd?:dd?:dd?', str_1)
=> ['00:00:00', '00:20:00', '8:00:00']

re.split(r'dd?:dd?:dd?', str_1)
=> ['', ' Segment 1 ', ' Segment 2 ', ' Segment 3']


the above works fine but won't be able to handle str_2. If I made the third pair of numbers , it just returns the optional group



re.findall(r'dd?:dd?(:dd?)?', str_1)
=> [':00', ':00', ':00']

re.split(r'dd?:dd?(:dd?)?', str_1)
=> ['', ':00', ' Segment 1 ', ':00', ' Segment 2 ', ':00', ' Segment 3']

re.findall(r'dd?:dd?(:dd?)?', str_2)
=> ['', '']

re.split(r'dd?:dd?(:dd?)?', str_2)
=> ['', None, ' Segment 1 ', None, ' Segment 2']


However, if I made the optional group without capturing, str_2 works fine but results are mixed with str_1



re.findall(r'dd?:dd?(?:dd?)?', str_1)
=> ['00:00', '00:20', '8:00']

re.split(r'dd?:dd?(?:dd?)?', str_1)
=> ['', ':00 Segment 1 ', ':00 Segment 2 ', ':00 Segment 3']

re.findall(r'dd?:dd?(?:dd?)?', str_2)
=> ['00:00', '20:0']

re.split(r'dd?:dd?(?:dd?)?', str_2)
=> ['', ' Segment 1 ', ' Segment 2']


I want to find a regex which works fine on both str_ and str_2, kind of have the optional group but without the capturing effect. Anyway to achieve that?










share|improve this question



























    3














    I have strings like "00:00:00 Segment 1 00:20:00 Segment 2 8:00:00 Segment 3" and "00:00 Segment 1 20:0 Segment 2" and want to use re.split() and re.findall() to find all the timestamps and segment names. But I am having problem to achieve optional group without the capturing effect. Here are what I got:



    str_1 = "00:00:00 Segment 1 00:20:00 Segment 2 8:00:00 Segment 3"
    str_2 = "00:00 Segment 1 20:0 Segment 2"

    re.findall(r'dd?:dd?:dd?', str_1)
    => ['00:00:00', '00:20:00', '8:00:00']

    re.split(r'dd?:dd?:dd?', str_1)
    => ['', ' Segment 1 ', ' Segment 2 ', ' Segment 3']


    the above works fine but won't be able to handle str_2. If I made the third pair of numbers , it just returns the optional group



    re.findall(r'dd?:dd?(:dd?)?', str_1)
    => [':00', ':00', ':00']

    re.split(r'dd?:dd?(:dd?)?', str_1)
    => ['', ':00', ' Segment 1 ', ':00', ' Segment 2 ', ':00', ' Segment 3']

    re.findall(r'dd?:dd?(:dd?)?', str_2)
    => ['', '']

    re.split(r'dd?:dd?(:dd?)?', str_2)
    => ['', None, ' Segment 1 ', None, ' Segment 2']


    However, if I made the optional group without capturing, str_2 works fine but results are mixed with str_1



    re.findall(r'dd?:dd?(?:dd?)?', str_1)
    => ['00:00', '00:20', '8:00']

    re.split(r'dd?:dd?(?:dd?)?', str_1)
    => ['', ':00 Segment 1 ', ':00 Segment 2 ', ':00 Segment 3']

    re.findall(r'dd?:dd?(?:dd?)?', str_2)
    => ['00:00', '20:0']

    re.split(r'dd?:dd?(?:dd?)?', str_2)
    => ['', ' Segment 1 ', ' Segment 2']


    I want to find a regex which works fine on both str_ and str_2, kind of have the optional group but without the capturing effect. Anyway to achieve that?










    share|improve this question

























      3












      3








      3







      I have strings like "00:00:00 Segment 1 00:20:00 Segment 2 8:00:00 Segment 3" and "00:00 Segment 1 20:0 Segment 2" and want to use re.split() and re.findall() to find all the timestamps and segment names. But I am having problem to achieve optional group without the capturing effect. Here are what I got:



      str_1 = "00:00:00 Segment 1 00:20:00 Segment 2 8:00:00 Segment 3"
      str_2 = "00:00 Segment 1 20:0 Segment 2"

      re.findall(r'dd?:dd?:dd?', str_1)
      => ['00:00:00', '00:20:00', '8:00:00']

      re.split(r'dd?:dd?:dd?', str_1)
      => ['', ' Segment 1 ', ' Segment 2 ', ' Segment 3']


      the above works fine but won't be able to handle str_2. If I made the third pair of numbers , it just returns the optional group



      re.findall(r'dd?:dd?(:dd?)?', str_1)
      => [':00', ':00', ':00']

      re.split(r'dd?:dd?(:dd?)?', str_1)
      => ['', ':00', ' Segment 1 ', ':00', ' Segment 2 ', ':00', ' Segment 3']

      re.findall(r'dd?:dd?(:dd?)?', str_2)
      => ['', '']

      re.split(r'dd?:dd?(:dd?)?', str_2)
      => ['', None, ' Segment 1 ', None, ' Segment 2']


      However, if I made the optional group without capturing, str_2 works fine but results are mixed with str_1



      re.findall(r'dd?:dd?(?:dd?)?', str_1)
      => ['00:00', '00:20', '8:00']

      re.split(r'dd?:dd?(?:dd?)?', str_1)
      => ['', ':00 Segment 1 ', ':00 Segment 2 ', ':00 Segment 3']

      re.findall(r'dd?:dd?(?:dd?)?', str_2)
      => ['00:00', '20:0']

      re.split(r'dd?:dd?(?:dd?)?', str_2)
      => ['', ' Segment 1 ', ' Segment 2']


      I want to find a regex which works fine on both str_ and str_2, kind of have the optional group but without the capturing effect. Anyway to achieve that?










      share|improve this question













      I have strings like "00:00:00 Segment 1 00:20:00 Segment 2 8:00:00 Segment 3" and "00:00 Segment 1 20:0 Segment 2" and want to use re.split() and re.findall() to find all the timestamps and segment names. But I am having problem to achieve optional group without the capturing effect. Here are what I got:



      str_1 = "00:00:00 Segment 1 00:20:00 Segment 2 8:00:00 Segment 3"
      str_2 = "00:00 Segment 1 20:0 Segment 2"

      re.findall(r'dd?:dd?:dd?', str_1)
      => ['00:00:00', '00:20:00', '8:00:00']

      re.split(r'dd?:dd?:dd?', str_1)
      => ['', ' Segment 1 ', ' Segment 2 ', ' Segment 3']


      the above works fine but won't be able to handle str_2. If I made the third pair of numbers , it just returns the optional group



      re.findall(r'dd?:dd?(:dd?)?', str_1)
      => [':00', ':00', ':00']

      re.split(r'dd?:dd?(:dd?)?', str_1)
      => ['', ':00', ' Segment 1 ', ':00', ' Segment 2 ', ':00', ' Segment 3']

      re.findall(r'dd?:dd?(:dd?)?', str_2)
      => ['', '']

      re.split(r'dd?:dd?(:dd?)?', str_2)
      => ['', None, ' Segment 1 ', None, ' Segment 2']


      However, if I made the optional group without capturing, str_2 works fine but results are mixed with str_1



      re.findall(r'dd?:dd?(?:dd?)?', str_1)
      => ['00:00', '00:20', '8:00']

      re.split(r'dd?:dd?(?:dd?)?', str_1)
      => ['', ':00 Segment 1 ', ':00 Segment 2 ', ':00 Segment 3']

      re.findall(r'dd?:dd?(?:dd?)?', str_2)
      => ['00:00', '20:0']

      re.split(r'dd?:dd?(?:dd?)?', str_2)
      => ['', ' Segment 1 ', ' Segment 2']


      I want to find a regex which works fine on both str_ and str_2, kind of have the optional group but without the capturing effect. Anyway to achieve that?







      python regex






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      asked Nov 14 '18 at 1:16









      hanaZ

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          It looks like you're missing the : in your pattern; you need two, one for the ?: and one for your literal :, ala:



          re.findall(r'dd?:dd?(?::dd?)?', str_1)
          => ['00:00:00', '00:20:00', '8:00:00']





          share|improve this answer





















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            1 Answer
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            active

            oldest

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            0














            It looks like you're missing the : in your pattern; you need two, one for the ?: and one for your literal :, ala:



            re.findall(r'dd?:dd?(?::dd?)?', str_1)
            => ['00:00:00', '00:20:00', '8:00:00']





            share|improve this answer


























              0














              It looks like you're missing the : in your pattern; you need two, one for the ?: and one for your literal :, ala:



              re.findall(r'dd?:dd?(?::dd?)?', str_1)
              => ['00:00:00', '00:20:00', '8:00:00']





              share|improve this answer
























                0












                0








                0






                It looks like you're missing the : in your pattern; you need two, one for the ?: and one for your literal :, ala:



                re.findall(r'dd?:dd?(?::dd?)?', str_1)
                => ['00:00:00', '00:20:00', '8:00:00']





                share|improve this answer












                It looks like you're missing the : in your pattern; you need two, one for the ?: and one for your literal :, ala:



                re.findall(r'dd?:dd?(?::dd?)?', str_1)
                => ['00:00:00', '00:20:00', '8:00:00']






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 14 '18 at 1:27









                B. Morris

                1667




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