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

Answer 1

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

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

Online Demo

Answer 2

You can use this negative regex with word boundary:

/^(?!side$)/i