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I am familiar with Perl’s strong parsing abilities using regular expressions.
Is it efficient?
What other languages have strong parsing ability and perform efficiently?
SNOBOL and Icon are two other languages devoted to manipulate strings. The first one is rather old while the second is not used much.
Anyway, I would start from your problem. Depending what are you trying to achieve (and you constraints) you might discover that even AWK, sed or gema would be a perfect match for your needs. Or not …
I would dare to say that if parsing is so prominent in your task, you might benefit from using a parser generator (lex/yacc, ANTLR, lemon, …).