When a regular expression is used in a "Verify" step in a TruClient for Internet Explorer or TruClient for Firefox script, the replay of the step fails.
This is specific to LoadRunner 12.00 and is not reproduced in previous versions of LoadRunner.
A hotfix which resolves this issue is provided in the following knowledge document:
http://support.openview.hp.com/selfsolve/document/KM00966360