match_parens – Easily detect mismatched parens

Mis­matches of paren­the­ses, braces, (an­gle) brack­ets, es­pe­cially in TeX sources which may be rich in those, may be dif­fi­cult to trace. This lit­tle script helps you by writ­ing your text to stan­dard out­put, af­ter adding a left mar­gin to your text, which will nor­mally be al­most empty, but will clearly show any mis­matches.