Javascript regex match doesn't contain keyword

Question

I would like to match a string that not start with keyword "side" (case sensitive)...

I have tried like this: /^(?!side).*$/i but don't work for me because I would like to accept for example: "side1", "side 1"

I hope I was clear

Edited:

Expression cannot contain only the word "side" with any given case.
If the expression has the word side it must be accompanied by something else meaning more characters.

Bye

In what sense does "side 1" not start with the keyword "side"? — Pointy
– Pointy, Commented Oct 26, 2015 at 14:10
yes... but for me is only wrog "side", "Side", "SIDE", "sIdE". All the other it's ok — Francesco G.
– Francesco G., Commented Oct 26, 2015 at 14:19
@FrancescoG. what you are saying is that "Side" is incorrect but "Side something else" is correct — Dalorzo
– Dalorzo, Commented Oct 26, 2015 at 14:21
OK, one more time: how does "side 1" not start with "side"? (Note that it does start with "side".) — Pointy
– Pointy, Commented Oct 26, 2015 at 14:21

anubhava · Accepted Answer · 2015-10-26 14:22:49Z

1

You can use this negative regex with word boundary:

/^(?!side$)/i

edited Oct 26, 2015 at 14:22

answered Oct 26, 2015 at 14:09

anubhava

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8 Comments

Dalorzo Over a year ago

this does not seem to be the answer of unclear question

Francesco G. Over a year ago

It's ok for "side1", but no for "side 1"

Dalorzo Over a year ago

still it is not matching anything just avoid to match side

anubhava Over a year ago

What do you mean by not matching anything? Check this regex There are 2 matches

Dalorzo Over a year ago

what is the matching pattern of your expression above? There is only a Negative Lookahead but nothing else

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Dalorzo · Accepted Answer · 2015-10-26 14:31:30Z

0

OK I would to take a leap of faith here...

(?!^side$)\b.+\b

Online Demo

edited Oct 26, 2015 at 14:31

answered Oct 26, 2015 at 14:27

Dalorzo

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2 Comments

anubhava Over a year ago

Now this regex is same as my answer :)

Francesco G. Over a year ago

yesss... thank so much to everybody! For me regex is arabic

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