regEx duplicate character class

Asked Oct 23 '17 at 08:00

Active Oct 23 '17 at 08:00

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var regEx = /[24680]d*[24680]/

for this regEx variable I was wondering what does it actually mean for this to have double [24680]. I know d means digits from 0 to 9 to clarify that this sin't just one single number and the * is a quantifier that means if it runs zero or more times in a given string... But why is it necessary to put it twice?

asked Oct 23 '17 at 08:00

ACODE91

1

You can check if you understand the pattern correctly [here](https://regex101.com/r/ENFSsR/1). `d` matches a `d` letter, `d*` matches 0+ `d`s, and `[24680]` just matches any single even digit. – Wiktor Stribiżew Oct 23 '17 at 08:04
great website! Thanks! – ACODE91 Oct 23 '17 at 20:30

regEx duplicate character class

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