Regular expression to get a string between two strings in Javascript

Question

I have found very similar posts, but I can\'t quite get my regular expression right here.

I am trying to write a regular expression which returns a string which is b

Answer 1

A lookahead (that (?= part) does not consume any input. It is a zero-width assertion (as are boundary checks and lookbehinds).

You want a regular match here, to consume the cow portion. To capture the portion in between, you use a capturing group (just put the portion of pattern you want to capture inside parenthesis):

cow(.*)milk

No lookaheads are needed at all.