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2838683
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2010-05-15T02:32:59.743
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2017-05-23T12:13:27.920
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<p>Actually this is possible with lookarounds. Instead of:</p> <pre><code>href="(.*)"> </code></pre> <p>You want</p> <pre><code>(?<=href=").*(?=">) </code></pre> <p>Now this will match (and therefore capture into group 0) any <code>.*</code> that is preceded by <code>href="</code> and followed by <code>"></code>. Note that I highly suspect that you really need <code>.*?</code> instead, i.e. reluctant instead of greedy.</p> <pre><code>---A--Z---A--Z---- ^^^^^^^^^^^ A.*Z </code></pre> <p>In any case, it looks like PHP's <code>preg</code> is PCRE, so it should support lookarounds.</p> <h3>regular-expressions.info links</h3> <ul> <li><a href="http://www.regular-expressions.info/lookaround.html" rel="nofollow noreferrer">Lookaround</a></li> <li><a href="http://www.regular-expressions.info/refflavors.html" rel="nofollow noreferrer">Flavor comparison</a> <ul> <li>PHP's <code>preg</code> functions implement the PCRE flavor.</li> <li>PCRE: <ul> <li><code>(?=regex)</code> (positive lookahead): YES</li> <li><code>(?<=text)</code> (positive lookbehind): fixed + alternation</li> </ul></li> </ul></li> </ul> <hr> <h3>Demonstration</h3> <pre><code><?php $haystack = '<a href="/foo.php">Go To Foo</a><a href="/bar.php">Go To Bar</a>'; $needle = '/(?<=href=").*?(?=">)/'; preg_match_all($needle,$haystack,$matches); print_r($matches); ?> </code></pre> <p><a href="http://ideone.com/P5jRM" rel="nofollow noreferrer">Running this on ideone.com</a> produces:</p> <pre><code>Array ( [0] => Array ( [0] => /foo.php [1] => /bar.php ) ) </code></pre> <h3>Related questions</h3> <p>These are mostly Java, but the regex part covers using lookarounds/assertions:</p> <ul> <li><a href="https://stackoverflow.com/questions/2819933/java-split-is-eating-my-characters/">Java split is eating my characters</a></li> <li><a href="https://stackoverflow.com/questions/2406633/can-you-use-zero-width-matching-regex-in-string-split">Can you use zero-width matching regex in String split?</a></li> <li><a href="https://stackoverflow.com/questions/2559759/how-do-i-convert-camelcase-into-human-readable-names-in-java">How do I convert CamelCase into human-readable names in Java?</a></li> </ul>
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1. POIn PHP how do I complete a regex that returns only what was grouped
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1. COI enjoyed reading this answer, but it does not really answer the original question, since grouping was specifically mentioned.
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2. COSorry if my question was misleading but this is the answer I really needed. After I got over this hurdle I was going to work on generalizing this regex so it could work with multiple links. polygenelubricants' answer already anticipated that. Thank you!
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