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<?php $file = '/css/base.css'; $mtime = 1221534296; echo "Yours: " , preg_replace('{\\.([^./]+)$}', ".$mtime.\$1", $file); echo "\n---\nMine: " , preg_replace('~(?=[^./]+$)~', "$mtime.", $file, 1); echo "\n---\nOr: " , preg_replace('~\.\K(?=[^./]+$)~', "$mtime.", $file); echo "\n---\nOr: " , preg_replace('~(?=\.[^./]+$)~', ".$mtime", $file);
Output for rfc.property-hooks, git.master, git.master_jit
Yours: /css/base.1221534296.css --- Mine: /css/base.1221534296.css --- Or: /css/base.1221534296.css --- Or: /css/base.1221534296.css

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