Regex to validate against URL

Question

We have regex to validate URL. I need a regex that will validate against it. Kindly help me in this.

URL for proper validation

var regexp = /(ftp|http|https)://(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(/|/([\w#!:.?+=&%@!-/]))?/

What's for validating against, i.e it should not be a URL.

Thanks, but this checks if it is a URL. I want to check if it is not a URL. Right opposite. — Anusha Swaminathan, Sep 15 '14 at 10:07
When you do your Regex validation, instead of `if([function you use to check])`, just write `if(![function you use to check])`. The ! (not operator) negates whatever boolean value you check for, True becomes false and false becomes true. I'll add this as an answer. — Nzall, Sep 15 '14 at 10:12
Thanks, but I need a new regex.. I was not advised to negate completely. — Anusha Swaminathan, Sep 15 '14 at 10:13

score 0 · Answer 1 · answered Sep 15 '14 at 10:14

0

Just negate the regex using negative lookahead,

^(?!^((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[\w]*))?)$).*$

DEMO

answered Sep 15 '14 at 10:14

Avinash Raj

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Regex to validate against URL

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