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Thread: Regex remove all but alpha numeric and -_

  1. #1
    Join Date
    Jun 2008
    Posts
    207

    Regex remove all but alpha numeric and -_

    Hi, I would like to remove all chars but alpha numeric and _- from a string.

    I have got this so far:

    preg_replace('/[^a-zA-Z0-9\s]/', '', $string)

    But i don't know how to leave in - and _

    Any help would be much appreciated.

  2. #2
    Join Date
    Aug 2004
    Location
    Ankh-Morpork
    Posts
    18,912
    You can just add the underscore directly into the character class. For the hyphen, you can do the same if you make it the very last thing in the class (so that it is not interpreted as indicating a range of characters, or it can be anywhere if you escape it with a back-slash.
    "Please give us a simple answer, so that we don't have to think, because if we think, we might find answers that don't fit the way we want the world to be."
    ~ Terry Pratchett in Nation

    eBookworm.us

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