Processing text / regexps

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  • Geoff Soper
    #1

    Processing text / regexps

    I'm trying to work out how to process a block of text which contains tags
    similar to [link]http://something.com[/link]. I want to work through the
    text block and pass the contents of each tag to function and then carry on
    through the text when the function returns. I don't necessarily want to
    change the text block, I think if I did it would make it easier as then I
    could use a loop though the changing block with a regexp to find the next
    unchanged tag until it could find no matches. Can anyone suggest a method of
    doing it without changing the text block?

    Many thanks,
    Geoff


    Tags: None
    • Chung Leong
      #2
      Re: Processing text / regexps

      "Geoff Soper" <geoff.news.nos pam@alphaworks. co.uk> wrote in message
      news:406b37ff$0 $6551$cc9e4d1f@ news-text.dial.pipex .com...[color=blue]
      > I'm trying to work out how to process a block of text which contains tags
      > similar to [link]http://something.com[/link]. I want to work through the
      > text block and pass the contents of each tag to function and then carry on
      > through the text when the function returns. I don't necessarily want to
      > change the text block, I think if I did it would make it easier as then I
      > could use a loop though the changing block with a regexp to find the next
      > unchanged tag until it could find no matches. Can anyone suggest a method[/color]
      of[color=blue]
      > doing it without changing the text block?[/color]

      Use preg_replace_ca llback(). No looping. No changing the original text.

      function TurnIntoAnchorT ag($matches) {
      $url = htmlspecialchar s($matches[1]);
      return "<a href=\"$url\">" $url"</a>";
      }

      $new_text = preg_replace_ca llback('/[link](.*?)[\/link]/i',
      'TurnIntoAnchor Tag', $text);


        Comment

        • Geoff Soper
          #3
          Re: Processing text / regexps

          "Chung Leong" <chernyshevsky@ hotmail.com> wrote in message news:<puidnQKtt L5IwvbdRVn-uw@comcast.com> ...[color=blue]
          > "Geoff Soper" <geoff.news.nos pam@alphaworks. co.uk> wrote in message
          > news:406b37ff$0 $6551$cc9e4d1f@ news-text.dial.pipex .com...[color=green]
          > > I'm trying to work out how to process a block of text which contains tags
          > > similar to [link]http://something.com[/link]. I want to work through the
          > > text block and pass the contents of each tag to function and then carry on
          > > through the text when the function returns. I don't necessarily want to
          > > change the text block, I think if I did it would make it easier as then I
          > > could use a loop though the changing block with a regexp to find the next
          > > unchanged tag until it could find no matches. Can anyone suggest a method[/color]
          > of[color=green]
          > > doing it without changing the text block?[/color]
          >
          > Use preg_replace_ca llback(). No looping. No changing the original text.
          >
          > function TurnIntoAnchorT ag($matches) {
          > $url = htmlspecialchar s($matches[1]);
          > return "<a href=\"$url\">" $url"</a>";
          > }
          >
          > $new_text = preg_replace_ca llback('/[link](.*?)[\/link]/i',
          > 'TurnIntoAnchor Tag', $text);[/color]

          Brilliant, thanks very much

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