Yet another Regexp question

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  • HaggMan
    #1

    Yet another Regexp question

    I'm trying to get the regular expression which matches text between two
    underscores:
    _MATCHTHIS_

    The problem is, I don't want to match it if the only thing in between
    the underscores are spaces or other underscores:
    _ _ _
    (this should get no match)

    _hello world_
    (this should match "hello world" even though there's a space because
    there's also things besides a space and underscore)

    Right now, I've got this:
    /_([^_]+?)_/ which does well at excluding _

    I've also tried this:
    /_([^_\s]+?)_/ which does well if there are NO spaces between the _'s.
    ie:
    _hello_
    (correctly matches "hello")
    _hello world_
    (does not match "hello world" as I would like)
    _ _ _
    (correctly does not match this)

    I'm stumped. Any help?

    Tags: None
    • Rik
      #2
      Re: Yet another Regexp question

      HaggMan wrote:
      I'm trying to get the regular expression which matches text between
      two underscores:
      _MATCHTHIS_
      >
      The problem is, I don't want to match it if the only thing in between
      the underscores are spaces or other underscores:
      _ _ _
      (this should get no match)
      >
      _hello world_
      (this should match "hello world" even though there's a space because
      there's also things besides a space and underscore)
      >
      Right now, I've got this:
      /_([^_]+?)_/ which does well at excluding _
      >
      I've also tried this:
      /_([^_\s]+?)_/ which does well if there are NO spaces between the _'s.
      ie:
      _hello_
      (correctly matches "hello")
      _hello world_
      (does not match "hello world" as I would like)
      _ _ _
      (correctly does not match this)
      /_(\s*(:?[^_\s]+\s*)+)_/

      Grtz,
      --
      Rik Wasmus


        Comment

        • Chung Leong
          #3
          Re: Yet another Regexp question

          HaggMan wrote:
          I'm trying to get the regular expression which matches text between two
          underscores:
          _MATCHTHIS_
          >
          The problem is, I don't want to match it if the only thing in between
          the underscores are spaces or other underscores:
          _ _ _
          (this should get no match)
          >
          _hello world_
          (this should match "hello world" even though there's a space because
          there's also things besides a space and underscore)
          >
          Right now, I've got this:
          /_([^_]+?)_/ which does well at excluding _
          >
          I've also tried this:
          /_([^_\s]+?)_/ which does well if there are NO spaces between the _'s.
          ie:
          _hello_
          (correctly matches "hello")
          _hello world_
          (does not match "hello world" as I would like)
          _ _ _
          (correctly does not match this)
          >
          I'm stumped. Any help?
          Is _hello_world_ a match or not? The following pattern might be what
          you need:

          /\b_\B(.+?)\B_\b/

          Boundary conditions are used here instead of conditions on what's
          inside.

            Comment

            • HaggMan
              #4
              Re: Yet another Regexp question

              Thank you to both of you! I'll try them out tonight.

              _hello_world_ should match "hello" but not "world_" though it should
              technically *never be used that way in what I'm doing.

              Chung Leong wrote:
              HaggMan wrote:
              I'm trying to get the regular expression which matches text between two
              underscores:
              _MATCHTHIS_

              The problem is, I don't want to match it if the only thing in between
              the underscores are spaces or other underscores:
              _ _ _
              (this should get no match)

              _hello world_
              (this should match "hello world" even though there's a space because
              there's also things besides a space and underscore)

              Right now, I've got this:
              /_([^_]+?)_/ which does well at excluding _

              I've also tried this:
              /_([^_\s]+?)_/ which does well if there are NO spaces between the _'s.
              ie:
              _hello_
              (correctly matches "hello")
              _hello world_
              (does not match "hello world" as I would like)
              _ _ _
              (correctly does not match this)

              I'm stumped. Any help?
              >
              Is _hello_world_ a match or not? The following pattern might be what
              you need:
              >
              /\b_\B(.+?)\B_\b/
              >
              Boundary conditions are used here instead of conditions on what's
              inside.

                Comment

                • Chung Leong
                  #5
                  Re: Yet another Regexp question

                  HaggMan wrote:
                  Thank you to both of you! I'll try them out tonight.
                  >
                  _hello_world_ should match "hello" but not "world_" though it should
                  technically *never be used that way in what I'm doing.
                  >
                  Then my pattern won't work.

                    Comment

                    • HaggMan
                      #6
                      Re: Yet another Regexp question

                      Well, Rik's worked. Thank you both!


                      Chung Leong wrote:
                      HaggMan wrote:
                      Thank you to both of you! I'll try them out tonight.

                      _hello_world_ should match "hello" but not "world_" though it should
                      technically *never be used that way in what I'm doing.
                      >
                      Then my pattern won't work.

                        Comment

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