Pattern in lookbehind

Question

My question is related with lookbehinds, I want to find all the first numbers after the word \"this\", I have the following data:

188282 this is an exam

Answer 1

Yes, you can use patterns inside lookbehinds, but that you can't do in most flavor of regex is to have a variable length lookbehind. In other words, you can't use a quantifier (but a fixed quantifier like {n} is allowed) inside a lookbehind. But some regex flavour allows you to use the alternation | or a limited (like in java) quantifier {1,n}.

With .net languages variable length lookbehinds are allowed.