[rt-users] Regular expressions (Perl regex) for validation

[Marc Chantreux]

On Tue, Sep 30, 2014 at 09:18:37AM -0400, Gaston Huot wrote:
> In this custom field, the user has to enter: 
>   -either nothing 
>   -either a number of exactly 2 digits  

if you use the x modifier:


    (
        # Nothing 
    |   
        \d{2} # two digits
    )

the old school one is 

    (|\d{2}) 

HTH 

-- 
Marc Chantreux,
Mes coordonnées: http://annuaire.unistra.fr/chercher?n=chantreux
Direction Informatique, Université de Strasbourg (http://unistra.fr) 
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