Regex syntax

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This article is currently a stub; it means I'm aware it's short and I probably intend to expand on the subject in the future!

I can never remember which programs use which regex variants, so here's a quick recap sheet.

grep (GNU) sed (GNU) vim less (GNU) python
capture \( ... \) \( ... \) \( ... \) ( ... ) ( ... )
option \| \| \| | |
word boundary \< or \> \< or \> \< or \> \< or \> \b
zero or one \? \? \? ? ?
zero or more * * * * *
zero or more (non-greedy) \{-} (unknown) *?
one or more \+ \+ \+ + +
one or more (non-greedy) \{-1,} (unknown) +?

References