An Emacs regexp for markdown links: "\[\(.*\)\](\(.*\))". Yikes.
miniblog.
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Devious regexp trick I've not seen before: [^]
Negating the empty set matches any character, which lets you emulate DOTALL (i.e. a . matches newlines too) on older regexp implementations.
I've just released v0.3 of deadgrep: https://github.com/Wilfred/deadgrep
This new version allows you to collapse file results, and is much smarter about regexp, case and file type settings!
I'm a huge fan of visual-regexp-replace. I've written crazy regexps that would be impossible without its feedback.

