Extract data from XHTML tag

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  • Markus Elfring
    #1

    Extract data from XHTML tag

    Hello,
    I try to get the contents behind the tag name.

    www@mike:/home/www > /usr/local/bin/php -a
    Interactive mode enabled

    <?php
    if (preg_match('<( ?:body|BODY)("[^"]*"|\'[^\']*\'|[^">\'])*>',
    '<body bgcolor="#fffff f">',
    $Match))
    {
    print($Match[1]);
    }
    else
    {
    print('No match!');
    }
    ?>
    X-Powered-By: PHP/4.2.3
    Content-type: text/html

    <br />
    <b>Warning</b>: Unknown modifier ''' in <b>-</b> on line <b>11</b><br
    />
    No match!


    Why does this pattern not work?
    I get more by the statements in the following programming language.

    % info tclversion
    8.3
    % if [regexp {<(?:body|BODY) ("[^"]*"|'[^']*'|[^">'])*>} {<body
    bgcolor="#fffff f">} X Match] \
    {
    puts "Match=$Mat ch"
    } \
    else \
    {
    puts {No match!}
    }
    Match="#ffffff"


    Have you got an idea?

    Best regards,
    Markus Elfring
    Tags: None
    • R. Rajesh Jeba Anbiah
      #2
      Re: Extract data from XHTML tag

      Markus.Elfring@ web.de (Markus Elfring) wrote in message news:<40ed1d8f. 0409060729.721b 7ef3@posting.go ogle.com>...[color=blue]
      > Hello,
      > I try to get the contents behind the tag name.[/color]

      <snip>

      XHTML codes can be treated like XML and so you can use XML parser
      functions <http://in.php.net/xml>

      --
      | Just another PHP saint |
      Email: rrjanbiah-at-Y!com

        Comment

        • Markus Elfring
          #3
          Re: Extract data from XHTML tag

          > if (preg_match('<( ?:body|BODY)("[^"]*"|\'[^\']*\'|[^">\'])*>',[color=blue]
          > '<body bgcolor="#fffff f">',
          > $Match))
          > [...]
          > <b>Warning</b>: Unknown modifier ''' in <b>-</b> on line <b>11</b>[/color]

          I forgot to add the Perl pattern delimiters because I tried the
          function "eregi" before.
          But it does not support non-capturing parentheses.

            Comment

            • Markus Elfring
              #4
              Re: Extract data from XHTML tag

              > <b>Warning</b>: Unknown modifier ''' in <b>-</b> on line <b>11</b>

              Is there a chance that this error message can be more precise?

              http://perldoc.com/perl5.8.4/pod/perlrequick.html


              I did not see the relation between the terms "modifier" and "delimiter" .
              How do you think about to get the message "Pattern delimiters are missing"?

                Comment

                • John Dunlop
                  #5
                  Re: Extract data from XHTML tag

                  Markus Elfring wrote:
                  [color=blue][color=green]
                  > > <b>Warning</b>: Unknown modifier ''' in <b>-</b> on line <b>11</b>[/color]
                  >
                  > Is there a chance that this error message can be more precise?[/color]

                  Yes, it can, but it probably won't.

                  Your expression was

                  <(?:body|BODY)( "[^"]*"|\'[^\']*\'|[^">\'])*>

                  The '<' is treated as the opening delimiter and the first
                  '>' as the ending delimiter. The character after the
                  expression proper -- the ''', because '\'' in a single-
                  quoted string means ''' -- is not a known pattern modifier.
                  [color=blue]
                  > http://perldoc.com/perl5.8.4/pod/perlrequick.html[/color]

                  PHP: PCRE Functions - Manual
                  http://www.php.net/manual/en/ref.pcre.php
                  PHP is a popular general-purpose scripting language that powers everything from your blog to the most popular websites in the world.

                  [color=blue]
                  > I did not see the relation between the terms "modifier" and "delimiter" .[/color]

                  Pattern modifiers affect matching. Delimiters enclose the
                  expression.
                  [color=blue]
                  > How do you think about to get the message "Pattern delimiters are missing"?[/color]

                  True, if both delimiters are actually missing. They're not
                  though: '<' and '>' are the delimiters.

                  --
                  Jock

                    Comment

                    • Markus Elfring
                      #6
                      Re: Extract data from XHTML tag

                      > XHTML codes can be treated like XML and so you can use XML parser[color=blue]
                      > functions <http://in.php.net/xml>[/color]

                      Another alternative:
                      PHP: DOM Functions - Manual
                      http://de.php.net/manual/en/ref.dom.php
                      PHP is a popular general-purpose scripting language that powers everything from your blog to the most popular websites in the world.


                      I prefer to build specific regular expressions for my needs instead of
                      to use the other programming interfaces.
                      I would use the XML/DOM APIs if I need more data and sophisticated
                      processing.

                        Comment

                        • Markus Elfring
                          #7
                          Re: Extract data from XHTML tag

                          > True, if both delimiters are actually missing. They're not[color=blue]
                          > though: '<' and '>' are the delimiters.[/color]

                          I have not found a documentation that specifies angle brackets as
                          valid (default) pattern delimiters.
                          http://perldoc.com/perl5.8.4/pod/perlretut.html

                            Comment

                            • Michael Fesser
                              #8
                              Re: Extract data from XHTML tag

                              .oO(Markus Elfring)
                              [color=blue][color=green]
                              >> True, if both delimiters are actually missing. They're not
                              >> though: '<' and '>' are the delimiters.[/color]
                              >
                              >I have not found a documentation that specifies angle brackets as
                              >valid (default) pattern delimiters.
                              >http://perldoc.com/perl5.8.4/pod/perlretut.html[/color]

                              XCVII. Regular Expression Functions (Perl-Compatible)
                              PHP: PCRE Functions - Manual
                              http://www.php.net/manual/en/ref.pcre.php
                              PHP is a popular general-purpose scripting language that powers everything from your blog to the most popular websites in the world.


                              "... Since PHP 4.0.4, you can also use Perl-style (), {}, [], and <>
                              matching delimiters."

                              Micha

                                Comment

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