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<?php $text = 'The $girl$ is a $good$ person, and keep $$this$$.'; echo preg_replace('/\${2,}[^\s$]+\${2,}(*SKIP)(*FAIL)|\$[^\s$]+\$/', '\$$0\$', $text);
Output for git.master, git.master_jit, rfc.property-hooks
The $$girl$$ is a $$good$$ person, and keep $$this$$.

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