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Regular Expression Pocket Reference, 2nd Edition
book

Regular Expression Pocket Reference, 2nd Edition

by Tony Stubblebine
July 2007
Intermediate to advanced content levelIntermediate to advanced
128 pages
2h 39m
English
O'Reilly Media, Inc.
Content preview from Regular Expression Pocket Reference, 2nd Edition

Examples

Example 1-1. Simple match

# Find Spider-Man, Spiderman, SPIDER-MAN, etc.
my $dailybugle = "Spider-Man Menaces City!";
if ($dailybugle =~ m/spider[- ]?man/i) { do_something(  ); }

Example 1-2. Match, capture group, and qr

# Match dates formatted like MM/DD/YYYY, MM-DD-YY,...
my $date  = "12/30/1969";
my $regex = qr!^(\d\d)[-/](\d\d)[-/](\d\d(?:\d\d)?)$!;
if ($date =~ $regex) {
  print "Day=  ", $1,
        " Month=", $2,
        " Year= ", $3;
}

Example 1-3. Simple substitution

# Convert <br> to <br /> for XHTML compliance
my $text = "Hello World! <br>";
$text =~ s#<br>#<br />#ig;

Example 1-4. Harder substitution

# urlify - turn URLs into HTML links
$text = "Check the web site, http://www.oreilly.com/catalog/
regexppr.";
$text =~
     s{
      \b                         # start at word boundary
      (                          # capture to $1
       (https?|telnet|gopher|file|wais|ftp) :
                                 # resource and colon
       [\w/#~:.?+=&%@!\-] +?     # one or more valid
                                 # characters
                                 # but take as little as
                                 # possible
      )
      (?=                        # lookahead
           [.:?\-] *             #  for possible punctuation
        (?: [^\w/#~:.?+=&%@!\-]  #  invalid character
          | $ )                  #  or end of string
      )
     }{<a href="$1">$1</a>}igox;
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Publisher Resources

ISBN: 9780596514273Errata Page