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This. We had a client complain that their password failed validation using IE7. Even simple passwords that should pass failed.

Turned out to be an IE7 specific regex bug (a look ahead bug), that we couldn't replicate using IE8 and IE9 set to IE7 compat mode.

Tracked down a copy of XP with IE7 and replicated the bug. Which led me to Google regex bugs related to IE7 and managed to track down the exact issue.

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