Regex invalid escape Javascript issue

Asked Oct 19 '18 at 21:33

Active Oct 19 '18 at 21:41

Viewed 183 times

Hi Guys i have an issue with one of my regular expressions, the regular expression itself functions but i have an error appear in FireFox developer

Unable to check because the pattern is not a valid regexp: invalid identity escape in regular expression

i am aware of identity escapes but not aware of how to apply it to this regex below

^(((\+44\s?\d{4}|\(?0\d{4}\)?)\s?\d{3}\s?\d{3})|((\+44\s?\d{4}|\(?0\d{4}\)?)\s?\d{5})|((\+44\s?\d{3}|\(?0\d{3}\)?)\s?\d{3}\s?\d{4})|((\+44\s?\d{2}|\(?0\d{2}\)?)\s?\d{4}\s?\d{4}))(\s?\#(\d{4}|\d{3}))?$

edited Oct 19 '18 at 21:41

Cid

14,968
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asked Oct 19 '18 at 21:33

Dean Beckerton

That's scary looking. It's hard to tell if it's even structured correctly. Try writing your RegEx using a tool like this: https://regex101.com/ – Herohtar Oct 19 '18 at 21:35
the `+` character at the begining is your problem. There's nothing to repeat before it – Cid Oct 19 '18 at 21:36
1

By the way, Java **is not** Javascript. – Cid Oct 19 '18 at 21:37
in this `(?0\d{4})`, the `?0` is invalid too – Cid Oct 19 '18 at 21:41
It does not work because of `\#`. It must be `#`. Remove that backslash and it should work. – Wiktor Stribiżew Oct 19 '18 at 21:42
Thank you everyone – Dean Beckerton Oct 19 '18 at 22:06

Regex invalid escape Javascript issue

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