What means + and * in regex expession

Question

I have this regex expression ^[?+ A-zA-Z0-9]*$, but it's not clear what + and * means. I searched on the Internet, but I did not find a clear explanation. Thanks a lot.

Wouldn't google be quicker - https://www.google.co.uk/search?q=regex+operators — Ed Heal, Aug 15 '17 at 10:21
see here, you will get your answer , https://stackoverflow.com/questions/10763820/difference-between-and-regex?answertab=votes#tab-top — Saikat Chakrabortty, Aug 15 '17 at 10:25

score 2 · Answer 1 · answered Aug 15 '17 at 10:19

2

They are quantifiers for repeating the patterns before them.

http://www.regular-expressions.info/repeat.html

answered Aug 15 '17 at 10:19

Frank R.

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What means + and * in regex expession

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