Brian Fraser dce8db5be1 Fix for 823431: pt-query-advisor hangs on big queries ...

This was caused by a regex backtracking itself to a halt. The solution
was to add a positive lookahead that searches for the floating but mandatory
substrings that the regex needs; if those exist, then eventually it will
match, but if they don't, it'll fail quickly.

2012-10-31 06:48:54 -03:00

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