How can I do approximate matching? See the module String::Approx available from CPAN.
How do I match a regular expression that's in a variable? ... Once you have the pattern in $regex, you use that variable in the match operator.
Each time you get a balanced match, remove its outer delimiter (that's the one you just matched so don't ... The outermost matches show up first and the nested matches show up later: Found: <brackets
How do I find matching/nesting anything?
How can I make \w match national character sets? Put use locale; in your script.
How do I efficiently match many regular expressions at once? ... contributed by brian d foy) You want to avoid compiling a regular expression every time you want to match
How can I match a locale-smart version of /[a-zA-Z]/?
How can I match strings with multibyte characters?
I'm having trouble matching over more than one line. What's wrong? ... or both) you might want to use: /s allows dot to include newline, and /m allows caret and dollar to match
How do I match XML, HTML, or other nasty, ugly things with a regex? Do not use regexes.
Subsequent matches start where the last successful match ended (the value of pos()) even if a match on ... match).
Remember, the trailing newline matches the \s+, and the $ anchor can match to the absolute end of the ... Instead of matching any whitespace (since that includes a newline), just match the other whitespace:
These strings match /\bPerl\b/. ... These strings match the pattern /\b'\b/.
That means that on every pattern match the entire string will be copied, part of it to $`, part to $& ... Thus the penalty is most severe with long strings and patterns that match often.
Most people mean that greedy regexes match as much as they can. ... quantifier effectively tells the regular expression engine to find a match as quickly as possible and
Octopus" Because . is special in regular expressions, and can match any single character, the regex ... P. here has matched the <Pl> in the original string.
What you can do is wrap a while() loop around a global pattern match. ... in list context, then assigns the result to a scalar, producing a count of the number of matches.
If you want to do fuzzy or close matching, you might also try the String::Approx, and Text::Metaphone
This does have the benefit of telling you how many matches it found, though. ... my @matches = grep $_ eq $whatever, @array;
Passing Regexes Here's an example of how to pass in a string and a regular expression for it to match ... my ($val1, $regex) = @_; my $retval = $val1 =~ /$regex/; return $retval; } $match
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match failure, but can also be because no match has yet been run on the scalar). ... the current match, such as in (?
If PATTERN matches the empty string, the EXPR is split at the match position (between characters). ... As a special case for split, the empty pattern given in match operator syntax (//) specifically matches
m// The match operator. See "Regexp Quote-Like Operators" in perlop.
.*)b/; The pattern match succeeds and $1 is defined, although it matched "nothing". ... It didn't really fail to match anything.
If the expression is omitted, one-match searches (m?pattern?) are reset to match again.
As such, glob("*.c *.h") matches all files with a .c or .h extension. ... .* *") matches all files in the current working directory.
When matching a pattern, the rarest character from the pattern would be looked up in this index.
string within another, but without the wildcard-like behavior of a full regular-expression pattern match
A non-blocking wait (with WNOHANG in FLAGS) can return 0 if there are child processes matching PID but
(That is, all ASCII characters not matching /[A-Za-z_0-9]/ will be preceded by a backslash in the returned ... (Not all the code points that match Pattern_Syntax have actually had characters assigned to them; so
If the two digests match, the password is correct.
On many operating systems, the native text file representation matches the internal representation, but
Such a scheme is sometimes preferable to matching particular string values of $@ with regular expressions
If an empty list, undef, or nothing that matches the first 3 values above is returned, then require looks
The mode you specify should match the mode of the original filehandle.
to improve legibility and maintainability of pack/unpack formats as /x can for complicated pattern matches
true if this pref has a 'match' attribute and at least one valid match attribute matches if ($pref ... ->matches(\%arg)) { ... } true if this pref matches the passed-in hashref, which must have a value for
--list-only|-l list matching filenames rather than extracting matches --verbose|-v write debugging ... --ignore-case (alias -i) Make pattern matching case-insensitive.
Ordinarily bsd_glob() continues to find matches. ... However, this does not match "normal practice" on these systems.
DESCRIPTION Modules that provide OS-specific behaviors often need to know if the current operating system matches
for a match. ... "Hello World" =~ m{World}; # matches, note the matching '{}' "/usr/bin/perl" =~ m"/perl"; # matches
match "Hello World" =~ /o W/; # matches "Hello World" =~ /oW/; # doesn't match "Hello World" ... matches "\n" $x =~ /girl.Who/m; # doesn't match, "." doesn't match "\n" $x =~ /girl.Who/sm; # matches
match (dot has to match a character) "\n" =~ /./ # No match (dot does not match a newline) "\ ... Any character not matched by \d is matched by \D.
Match 1 or 0 times {n} Match exactly n times {n,} Match at least n times {,n} Match ... match to the "worst" match, and it is the "best" match which is chosen.
only aa (two a's) also /i matches exclude ASCII/non-ASCII l match according to current locale u match ... prior to matched string ${^MATCH} Entire matched string ${^POSTMATCH} Everything after to matched
"cat\n" =~ /cat\Z/; # Match. "cat\n" =~ /cat\z/; # No match. ... "cat" =~ /\bcat\B/; # No match. "cats" =~ /\bcat\B/; # Match.
some already matched string REFF num 1 Match already matched string, using /di ... REFFU num 1 Match already matched string, usng /ui.
None are considered to match \w for example, but all match \W. ... Thus both these match: "0" =~ /\p{sc=Common}/ # Matches "0" =~ /\p{scx=Common}/ # Matches and
\n\n"); /** Match all occurrences of /wi../ **/ num_matches = matches(text, "m/(wi..) ... /g", &match_list); printf("matches: m/(wi..)/g found %d matches...
No match found for opening bracket extract_codeblock failed to find a closing bracket to match the ... tried to modify the matched text to produce a matching closing tag (because none was specified).
MATCH Turns on debugging of the main matching loop. ... BUFFERS Enable debugging the capture group storage during match.
Arguments: rx: the regex to match against sv: the SV being matched: only used for utf8 flag; ... would allow a match.
Matches a literal '.'. Equivalent to the Perl regular expression \. ... * Matches zero or more characters, except '/'.
$match_ref = $Collator->match($string, $substring) ($match) = $Collator->match($string, $substring ... if ($match_ref = $Collator->match($str, $sub)) { # scalar context print "matches [$$match_ref].
shell matches filenames. ... There are five pattern matching operations other than a strict one-to-one match between the pattern and
matches if ( $e->matches('open') ) { ... } if ( 'open' ~~ $e ) { ... } matches is used to determine ... On Perl 5.10 and above, using smart-match (~~) with an autodie::exception object will use matches underneath
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Smart match changes Since Perl 5.10.0, Perl's developers have made a number of changes to the smart ... match operator.
Smart match changes Changes to type-based dispatch The smart match operator ~~ is no longer commutative ... The full dispatch table for the smart match operator is given in "Smart matching in detail" in perlsyn
Smart match and overloading According to the rule of dispatch based on the rightmost argument type, ... Thus, writers of overloading routines for smart match mostly need to worry only with comparing against
Smart match and overloading According to the rule of dispatch based on the rightmost argument type, ... This way, distributivity of smart match across arrays is not broken, as well as the other behaviours
Switch and Smart Match operator Perl 5 now has a switch statement. ... This kind of match is called smart match, and it's also possible to use it outside of switch statements
Character matching routines in POSIX Use of any of these functions in the POSIX module is now deprecated
Smart-matching against array slices Previously, the following code resulted in a successful match:
make sense to have them match differently under /i case-insensitive matching. ... Now matching under /i gives the same results as non-/i matching except for those few properties where
\N{...} can now have Unicode loose name matching This is described in the charnames item in "Updated
@- and @+ provide starting/ending offsets of regex matches The new magic variables @- and @+ provide
\p{}, \P{} matching has changed for non-Unicode code points. ... Their behavior on matching these legal Unicode code points is unchanged, but there are changes for code
\p{All} has been expanded to match all possible code points The Perl-defined regular expression pattern ... element \p{All}, unused on CPAN, used to match just the Unicode code points; now it matches all possible
New Restrictions in Multi-Character Case-Insensitive Matching in Regular Expression Bracketed Character ... People were specifying things such as /[\0-\xff]/i, and being surprised that it matches the two character
Core Enhancements Limited variable length lookbehind in regular expression pattern matching is now experimentally
Incompatible Changes Certain pattern matching features are now prohibited in compiling Unicode property
One example is LATIN SMALL LETTER SHARP S which matches the sequence ss. ... This should match any sequences of characters that aren't the SHARP S nor what SHARP S matches under
One example is LATIN SMALL LETTER SHARP S which matches the sequence ss. ... This should match any sequences of characters that aren't the SHARP S nor what SHARP S matches under
-1 character precedes a character in the string that should match the pattern. ... This caused matches such as "f\x{FB00}" =~ /ff/i to fail.
<=(a|aa))/ should match and leave $1 equaling "a" or "aa". ... that we will keep the current "longest match" behavior.
single line match modifier /s. ... \N{3} means to match 3 non-newlines; \N{5,} means to match at least 5.
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