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The ? syntax group has to be the most unmemorable of the bunch. I've used it maybe over 1,000 times or so and I still have to look up ?: Or ?! ?< or whatever else.

I used to have a laminated sheet on my wall at an office because it was so terribly bad.

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Sub-expression or capture group: (foo)

Named capture group: (?<name>foo)

Non-capturing group: (?:foo)

Lookahead: (?=foo)

For negative lookahead, change = to !: (?!foo)

For lookbehind, add <: (?<=foo)

For negative lookbehind, change = to !: (?<!foo)

(Not from memory, had to look everything up...)

> (Not from memory, had to look everything up...)

right, great list but I'll forget it all by tomorrow.

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