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PO
 

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  1. PO
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    <p>Only the 4th test case is working.</p> <p>the first <code>m~href="(.*?)"~s</code> This will match the first href within your string and capture what is between the quotes so: <code>/hoh/hoh/hoh/hoh/hoh</code></p> <p>The second : <code>m~href="(.*?)".*&gt;lol~s</code> This will match the first href within your string and capture what is between the quotes, then match any any number of any character until it finds <code>&gt;lol</code> so: <code>/hoh/hoh/hoh/hoh/hoh</code></p> <p>Try capturing the <code>.*</code> with <code>m~href="(.*?)"(.*)&gt;lol~s</code> </p> <pre><code>$1 contains : /hoh/hoh/hoh/hoh/hoh $2 contains : class="hoh"&gt;hoh&lt;/a&gt; &lt;a href="/foo/foo/foo/foo/foo" class="foo"&gt;foo &lt;/a&gt; &lt;a href="/bar/bar/bar/bar/bar" class="bar"&gt;bar&lt;/a&gt; &lt;a href="/lol/lol/lol/lol/lol" class="lol" </code></pre> <p>the third : <code>m~href="(.*?)".*?&gt;lol~s</code> Same result as the previous test case.</p> <p>The fourth : <code>m~.*href="(.*?)".*?&gt;lol~s</code> This will match any number of any character then <code>href="</code> then capture any number of any character non-greedy until the quote, then match any any number of any character until it finds <code>&gt;lol</code> so: <code>/lol/lol/lol/lol/lol</code></p> <p>Try capturing all the <code>.*</code> with <code>m~(.*)href="(.*?)"(.*?)&gt;lol~s</code></p> <pre><code>$1 contains : &lt;a href="/hoh/hoh/hoh/hoh/hoh" class="hoh"&gt;hoh&lt;/a&gt; &lt;a href="/foo/foo/foo/foo/foo" class="foo"&gt;foo &lt;/a&gt; &lt;a href="/bar/bar/bar/bar/bar" class="bar"&gt;bar&lt;/a&gt; &lt;a $2 contains : /lol/lol/lol/lol/lol $3 contains : class="lol" </code></pre> <p>Have a look at <a href="http://chris.photobooks.com/regex/default.htm" rel="nofollow">this site</a> it explains what your regexes are doing.</p>
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    1. POperl non-greedy problem
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    1. PTAnswer
    1. USToto
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    1. COThanks for answering. You mention **what** happens (I already understand this), but not **why** it happens. Maybe my question wasn't written clearly, so I edited it.
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    2. CO@vkats: I would say because regex work this way :-) . It's trying to match the very first occurrence of what you're searching for.
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    3. COI know it tries to match what I told it to match. Obviously, I don't understand what I told it match, and that's what I try to do.
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