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  1. #1
    SitePoint Enthusiast
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    Use Of regullar Expressions

    A regular expression (regex or regexp for short) is a special text string for describing a search pattern. You can think of regular expressions as wildcards on steroids. You are probably familiar with wildcard notations such as *.txt to find all text files in a file manager. The regex equivalent is .*\.txt .

    But you can do much more with regular expressions. In a text editor like EditPad Pro or a specialized text processing tool like PowerGREP, you could use the regular expression \b[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b to search for an email address. Any email address, to be exact. A very similar regular expression (replace the first \b with ^ and the last one with $) can be used by a programmer to check if the user entered a properly formatted email address. In just one line of code, whether that code is written in Perl, PHP, Java, a .NET language or a multitude of other languages.

  2. #2
    SitePoint Wizard silver trophy
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    you like to copy other peoples work huh?

    at least give the author credit for the text you just posted, since its not your own words.

    http://www.regular-expressions.info/

  3. #3
    He's No Good To Me Dead silver trophybronze trophy stymiee's Avatar
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