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Regex search/replace

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  • 04-11-2007 2:30pm
    #1
    nobodythere
    Closed Accounts Posts: 2,349 ✭✭✭


    Hi all, I'm trying to get my head around regular expressions but it's proving difficult. I was hoping someone would save me many times and help me out here:
    <img src="/images/F.gif" style="margin-right: -25px; padding: 0;" alt="F" />

    that "F" could be any letter, and I want to search and replace that whole <img> thing with just "F" (or whatever letter there is).

    Help please :D


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    #2
    daymobrew
    Registered Users Posts: 6,509 ✭✭✭daymobrew 


    $ echo '<img src="/images/F.gif" style="margin-right: -25px; padding: 0;" alt="F" />' | sed 's/.* alt="\([a-zA-Z]\)".*/\1/'
F
    This extracts the character in the 'alt' part.

    What language are you trying to do this in? The regex syntax will be similar for most languages.


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    #3
    nobodythere
    Closed Accounts Posts: 2,349 ✭✭✭nobodythere


    Thanks got it sorted, I was trying to use %1 as a backreference but in PHP it's \\1


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