[removed] negative lookbehind equivalent?

Question

Is there a way to achieve the equivalent of a negative lookbehind in javascript regular expressions? I need to match a string that does not start with a specific set of cha

Answer 1

Using your case, if you want to replace m with something, e.g. convert it to uppercase M, you can negate set in capturing group.

match ([^a-g])m, replace with $1M

"jim jam".replace(/([^a-g])m/g, "$1M")
\\jiM jam

([^a-g]) will match any char not(^) in a-g range, and store it in first capturing group, so you can access it with $1.

So we find im in jim and replace it with iM which results in jiM.