The backreferences \1 and \2 should only be used inside a regular expression, outside a regular expression you should use $1 and $2 instead so that should be: 

s#^((?:[^/\n]|/(?!/))*),((?:\s*|//.*$|/\*(?:[^*]|\*(?!/))*\*/)*\s*[}\]
+])#$1$2#mg

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In reply to Re: Detecting Dangling Commas in JavaScript by Anonymous Monk
in thread Detecting Dangling Commas in JavaScript by wink

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