Regex syntax
- 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 | 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) | +? |