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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=23303 Perfomance problem with matching ^(_?[A-Z0-9]+)*$ pattern ------- Additional Comments From [EMAIL PROTECTED] 2003-09-22 15:15 ------- The error email says it takes over a minute to match the pattern against "_NOERROR_AND_LAST_TXN_NOT_OK_AND_LAST_TXN_WAS_" (and fail) but less than a millisecond to match the pattern against "_NOERROR_AND_LAST_TXN_NOT_OK_AND_LAST_TXN_WAS" (and succeed). These are the same strings except for the final "_". The "?" in the pattern gives a large degree of indeterminacy in how the match may be made if the greediest match fails. The equivalent pattern "^[A-Z0-9]*(_[A-Z0-9]+)*$" has much less indeterminacy and succeeds or fails very quickly with the above test strings. I am tempted to say that the problem lies more with the pattern than the matcher. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
