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copied!<p>how about:</p> <pre><code>preg_match('/\$__this(?:(\'|")\((.+?)\)\1)/', $string); </code></pre> <p><strong>explanation:</strong></p> <pre><code>(?-imsx:\$__this(?:(\'|")\((.+?)\)\1)) matches as follows: NODE EXPLANATION ---------------------------------------------------------------------- (?-imsx: group, but do not capture (case-sensitive) (with ^ and $ matching normally) (with . not matching \n) (matching whitespace and # normally): ---------------------------------------------------------------------- \$ '$' ---------------------------------------------------------------------- __this '__this' ---------------------------------------------------------------------- (?: group, but do not capture: ---------------------------------------------------------------------- ( group and capture to \1: ---------------------------------------------------------------------- \' ''' ---------------------------------------------------------------------- | OR ---------------------------------------------------------------------- " '"' ---------------------------------------------------------------------- ) end of \1 ---------------------------------------------------------------------- \( '(' ---------------------------------------------------------------------- ( group and capture to \2: ---------------------------------------------------------------------- .+? any character except \n (1 or more times (matching the least amount possible)) ---------------------------------------------------------------------- ) end of \2 ---------------------------------------------------------------------- \) ')' ---------------------------------------------------------------------- \1 what was matched by capture \1 ---------------------------------------------------------------------- ) end of grouping ---------------------------------------------------------------------- ) end of grouping ---------------------------------------------------------------------- </code></pre>

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