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Regexp help

  • 16-07-2009 04:26PM
    #1
    Cantab.
    Closed Accounts Posts: 1,444 ✭✭✭


    Been a long time since I've used regexps. I'm using the following regexp to allow alpha-numerics plus a few chars through.

    ^[0-9A-Za-z-_\.' ]+$

    Problem is, it returns false if the text field is false!

    How do I modify so it allows an empty text field?

    Many thanks,


Comments

  • #2
    Cantab.
    Closed Accounts Posts: 1,444 ✭✭✭Cantab.


    Ok...

    I figured it out. The * modifier.

    ^[0-9A-Za-z-\.' ]*$

    There goes an hour of my life...


  • #3
    Jonathan
    Moderators, Education Moderators, Home & Garden Moderators Posts: 8,313 Mod ✭✭✭✭Jonathan


    Cantab. wrote: »
    Ok...

    I figured it out. The * modifier.

    ^[0-9A-Za-z-\.' ]*$

    There goes an hour of my life...
    That not mean it will match anything because it matches your regex string zero times? :confused:

    Something like (^[0-9A-Za-z-_\.' ]+$)|(^$) not be safer?
    Match the existing regex or a empty string (I assume thats what a null form sends?)



    EDIT: nevermind. see where you're coming from.


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