regex negative lookahead using javascript

Question

And thanks for your help!

I am trying to do an negative inclusion

I have the following: 0[1-9][0-9]{5} this works for positive inclusion against this:
0258714 0465666 1213655 568464668 225 75487 021523 56556 0236589

but when I try this

(?!0[1-9][0-9]{5})

it doesn't include the opposite
0258714 0465666 1213655 568464668 225 75487 021523 56556 0236589

How could we get this to work?

see link for setup: https://regex101.com/r/OkMliM/1

You can prepend a word boundary and match the digits \b(?!0[1-9][0-9]{5})\d+ regex101.com/r/8HhsS8/1 — The fourth bird
– The fourth bird, Commented Sep 21, 2020 at 23:10

Natdrip · Accepted Answer · 2020-09-22 22:14:13Z

4

The lookahead by itself is unanchored and will match all the positions where the assertion is true.

What you can do is use a word boundary followed by the assertion. If it is true, then match 1 or more digits.

\b(?!0[1-9][0-9]{5}\s)\d+

See a regex demo

added an \s to make it work

edited Sep 22, 2020 at 22:14

Natdrip

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answered Sep 21, 2020 at 23:14

The fourth bird

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1 Comment

Natdrip Over a year ago

So I tried this with a long string today and it did not take: 0221547 02556 02662933434343423423423423505 0565 05 any suggestions... NVM I added a \s in the selector and it works

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