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The characters for extended regular expressions are invaluable; is there a way to turn them on so that I don't have to escape them in my Vim regex, much like the -E flag I can pass to grep(1)?
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A workaround is to remap / to prefix searches with "very magic" automatically:
Do
:help magicin vim and you'll see there are four levels (very magic, magic, nomagic, and very nomagic) but only the two central ones can be set globally (the default is magic, and with:setcommands you can only toggle between magic and nomagic); start your RE with\vto make all the rest of it "very magic" ("all ASCII characters except '0'-'9', 'a'-'z', 'A'-'Z' and '_' have a special meaning") -- but that applies only to that one specific RE!-)