Unfortunately we don't have any way to do that yet. It's certainly something we've discussed more than a few times. You might want to vote/watch the following feature request:
Just out of curiosity are you just looking for text in the master branches of each repository, or do you want to find text that is only in older versions of the source?
As a project manager, I have discovered that different developers want to bring their previous branching method with them when they join the team. Some developers are used to performing individual wo...
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