07-24-2008
this does not work:
/[a-zA-Z]+/
because it means one or more of the characters inside the square brackets, any of the characters, in any order. You want to find two of the same character repeated in a string, not one or more of any character inside the [] brackets.
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Hi,
Can anyone help me to find regular expression for the following in Perl?
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I have got numbers like
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xxxxx
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HI,
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Could anyone please make me understand how the ?= works below ..
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I am not a big expert in regex and have just little understanding of that language.
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LEARN ABOUT CENTOS
text::glob
Text::Glob(3) User Contributed Perl Documentation Text::Glob(3)
NAME
Text::Glob - match globbing patterns against text
SYNOPSIS
use Text::Glob qw( match_glob glob_to_regex );
print "matched
" if match_glob( "foo.*", "foo.bar" );
# prints foo.bar and foo.baz
my $regex = glob_to_regex( "foo.*" );
for ( qw( foo.bar foo.baz foo bar ) ) {
print "matched: $_
" if /$regex/;
}
DESCRIPTION
Text::Glob implements glob(3) style matching that can be used to match against text, rather than fetching names from a filesystem. If you
want to do full file globbing use the File::Glob module instead.
Routines
match_glob( $glob, @things_to_test )
Returns the list of things which match the glob from the source list.
glob_to_regex( $glob )
Returns a compiled regex which is the equivalent of the globbing pattern.
glob_to_regex_string( $glob )
Returns a regex string which is the equivalent of the globbing pattern.
SYNTAX
The following metacharacters and rules are respected.
"*" - match zero or more characters
"a*" matches "a", "aa", "aaaa" and many many more.
"?" - match exactly one character
"a?" matches "aa", but not "a", or "aaa"
Character sets/ranges
"example.[ch]" matches "example.c" and "example.h"
"demo.[a-c]" matches "demo.a", "demo.b", and "demo.c"
alternation
"example.{foo,bar,baz}" matches "example.foo", "example.bar", and "example.baz"
leading . must be explictly matched
"*.foo" does not match ".bar.foo". For this you must either specify the leading . in the glob pattern (".*.foo"), or set
$Text::Glob::strict_leading_dot to a false value while compiling the regex.
"*" and "?" do not match /
"*.foo" does not match "bar/baz.foo". For this you must either explicitly match the / in the glob ("*/*.foo"), or set
$Text::Glob::strict_wildcard_slash to a false value with compiling the regex.
BUGS
The code uses qr// to produce compiled regexes, therefore this module requires perl version 5.005_03 or newer.
AUTHOR
Richard Clamp <richardc@unixbeard.net>
COPYRIGHT
Copyright (C) 2002, 2003, 2006, 2007 Richard Clamp. All Rights Reserved.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
File::Glob, glob(3)
perl v5.16.3 2011-02-22 Text::Glob(3)