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Reg expression help!

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  • 11-05-2015 12:14pm
    #1
    SeamusHollahan
    Registered Users Posts: 29 ✭


    Hi Folks, total noob question here. I'd like to search for all image tags within a certain div element but just can't figure it out. I've been able to find a regular expression that will match all image tags within a HTML document but not within certain div tags.

    Currently i have: <img\s+[^>]*?src=("|')([^"']+)\1 but would like to use this to search for all image tags within the following DIV block (and class): <div class="lower-content-inner-right-top">

    If anyone could help or point me in the right direction, would really appreciate it!
    Thks
    S


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    #2
    bpmurray
    Registered Users Posts: 1,275 ✭✭✭bpmurray


    Your first expression seems a little overcooked if you're simply looking for images - this will find them: 
    <img\s[^>]*>
    The problem with finding tags embedded in another specific tag is that a regular expression is used to find a pattern in text, whereas this really needs to parse the text if you want to do it right. A simplistic (and wrong) solution would be to assume that the img is after the div: 
    <div\s[^>]*class="lower-content-inner-right-top"[^>]*>.*<img\s[^>]*>
    In reality you want lexical analysis.


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    #3
    SeamusHollahan
    Registered Users Posts: 29 ✭SeamusHollahan


    Thanks a million bpmurray, it worked a treat. The solution you provided works perfectly in this case as i need to search for all images that have been entered onto pages using a CMS and i know that these images exist only within the DIV tag i provided. Currently looping through all the site pages and the pages brought back all have images...

    Thanks again!
    S.


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    #4
    Skrynesaver
    Registered Users Posts: 1,109 ✭✭✭Skrynesaver


    WARNING, you're original regex would capture the whole tag where the tag looked like <img alt="Next>" src="button.gif"/>

    As bpmurray points out you should not attempt to parse html with regex html requires an actual parser and your language will have an XML/HTML parsing library.


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