PUBLIC MARKS with tag regexp

h : any horizontal white space character

outil de test de RegExp qui donne l'explication de ce qu'elles font

How to Write Regular Expressions ? The best way to learn regular expressions is by using an example. Let's say you're building a web page with a phone number input.

? where does my regexp mismatch ? die "wrong pattern on $`//$+//$'";

Regex101.com is a free of charge service where you can create, test and have your regular expressions explained. Thanks to the permalink feature, it is a great reference which may even be used in code where you need to explain your regular expressions to co-workers.

A nice regexp visualization tool. Very explanatory.

A nice regexp visualization tool. Very explanatory.

The /o option for regular expressions (documented in perlop and perlreref) tells Perl to compile the regular expression only once. This is only useful when the pattern contains a variable. Perls 5.6 and later handle this automatically if the pattern does not change.

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10 expressions regulières à Intégreer dans vos dev Web (validation URL / Mail / mot de passe...)