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POregular expression for checking attributes in an html tag
 

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  1. POregular expression for checking attributes in an html tag
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    <p>In an HTML source I need to extract any simple text inside a FONT tag with exactly (no more, no less) these 3 attributes, in any order: size=5, color="red", face="verdana".</p> <p>The regular expression must thus for example extract all the following "randomtext" except the last four.</p> <pre><code>&lt;font size=5 color="red" face="verdana"&gt;randomtext&lt;/font&gt; &lt;font size=5 face="verdana" color="red"&gt;randomtext&lt;/font&gt; &lt;font color="red" size=5 face="verdana"&gt;randomtext&lt;/font&gt; &lt;font color="red" face="verdana" size=5&gt;randomtext&lt;/font&gt; &lt;font face="verdana" size=5 color="red"&gt;randomtext&lt;/font&gt; &lt;font face="verdana" color="red" size=5&gt;randomtext&lt;/font&gt; &lt;font size=5 size=5 size=5&gt;randomtext&lt;/font&gt; &lt;font face="verdana" color="red" size=5 foobar="random"&gt;randomtext&lt;/font&gt; &lt;font face="verdana" color="red" size=5 foobar="random=pippo"&gt;randomtext&lt;/font&gt; &lt;font face="verdana" color="red" size=5 garbagetext&gt;randomtext&lt;/font&gt; </code></pre> <p>I solved the "in any order" problem by using 3 look-aheads:</p> <pre><code>&lt;font(?=[^&gt;]* size=5)(?=[^&gt;]* color="red")(?=[^&gt;]* face="verdana")[^&gt;]*&gt;([^&lt;]+)&lt;/font&gt; </code></pre> <p>...or for more html flexibility:</p> <pre><code>&lt;\s*font(?=[^&gt;]*\s+size\s*=\s*5)(?=[^&gt;]*\scolor\s*=\s*["']red["'])(?=[^&gt;]*\sface\s*=\s*["']verdana["'])[^&gt;]*&gt;\s*([^&lt;]+?)\s*&lt;\s*/font\s*&gt; </code></pre> <p>The problem is that it also matches the last three. How can I exclude those matching? (obviously in a general and reasonable short/efficient way, i.e. without codyfing all possible positive combinations and without using literal negative expressions that work only on my examples)</p>
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    1. PTQuestion
    1. USMichael Berkowski
    1. USImbuter
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    2. PO
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    1. This table or related slice is empty.
    1. COWhat language are you using? This task is much more easily handled with a proper HTML parsing library.
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      1. POregular expression for checking attributes in an html tag
      1. USMichael Berkowski
    2. COMichael, it must be solved in a single regular expression, language independent. Regex flavor is PCRE.
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      1. POregular expression for checking attributes in an html tag
      1. USImbuter
    3. COIs this homework?
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      1. POregular expression for checking attributes in an html tag
      1. UShuon
 

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