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<?php $string = 'whatever text including some $text between delimiters$ and...'; $string_replaced = preg_replace_callback('/\$[^$]*\$/', function($m) { return preg_replace('~\s+~u', ':', $m[0]); }, $string); echo $string_replaced;
Output for git.master, git.master_jit, rfc.property-hooks
whatever text including some $text:between:delimiters$ and...

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