Regex help

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  • rdimayuga
    #1

    Regex help

    I need a regex pattern that will match a string starting with zero or
    one dot's. For example, ".string" and "string" should both match, but
    something like "estring" should not match. So far, I've tried the
    following:

    \.*string
    [.]{0,1}string
    [\.]{0,1}string
    [^a-zA-z0-9]{0,1}string

    and none of these do the job 100%. I'm also wondering if there might
    be a bug in the regex library i'm using - it's a 3rd party class that
    somebody before me found and implemented. I have the source code for
    the regexp class if necessary. Any help would be appreciated. Please
    reply to rey_dimayuga@ho tmail.com.
    Tags: None
    • Eric J. Roode
      #2
      Re: Regex help

      -----BEGIN PGP SIGNED MESSAGE-----
      Hash: SHA1

      rey_dimayuga@ho tmail.com (rdimayuga) wrote in
      news:4b68b09f.0 309291644.12c8f a0b@posting.goo gle.com:
      [color=blue]
      > I need a regex pattern that will match a string starting with zero or
      > one dot's. For example, ".string" and "string" should both match, but
      > something like "estring" should not match. So far, I've tried the
      > following:
      >
      > \.*string
      > [.]{0,1}string
      > [\.]{0,1}string
      > [^a-zA-z0-9]{0,1}string
      >
      > and none of these do the job 100%. I'm also wondering if there might
      > be a bug in the regex library i'm using - it's a 3rd party class that
      > somebody before me found and implemented. I have the source code for
      > the regexp class if necessary. Any help would be appreciated.[/color]

      Well, if you're using a 3p regex library and not Perl's regexes, then who
      knows. I know Perl's regexes -- other regex languages vary widely.

      I would suggest, perhaps, that your regex needs to be anchored at the
      start of the string in order to work.

      [color=blue]
      > Please
      > reply to rey_dimayuga@ho tmail.com.[/color]

      Sorry, no. That's not how usenet works. Answers to questions are posted
      publicly so that all may benefit.

      Also, for your future reference, comp.lang.perl is a defunct newsgroup.
      You'll get a better response if you post to comp.lang.perl. misc; that's
      the newsgroup for general Perl questions.

      - --
      Eric
      $_ = reverse sort $ /. r , qw p ekca lre uJ reh
      ts p , map $ _. $ " , qw e p h tona e and print

      -----BEGIN PGP SIGNATURE-----
      Version: PGPfreeware 7.0.3 for non-commercial use <http://www.pgp.com>

      iQA/AwUBP3q8sGPeouI eTNHoEQJE2wCfQR 4zi6kxp1ir24xnP chrsu0NIO0AnjFz
      Rp7DmsLiPBgIHDK rJ8fomcXv
      =/LtP
      -----END PGP SIGNATURE-----

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