Question

Here is the demo String:

beforeValueAfter

Assume that I know the value I want is between “before” and “After”
I want to extact the “Value” using the regex….

pervious909078375639355544after

Assume that I know the value I want is between “pervious90907” and “55544after”
I want to extact the “83756393” using the regex….

thx in advance.

Answer 1

The answer depends on two things:

• If you know exactly what the value consists of (if you know it will be digits, etc., it makes it easier). If it could be anything, the answer is a little harder.
• If your system is greedy/ungreedy by default, it affects the way you’d set up the expression. I will assume it is greedy by default.

If it can be anything (the ? will be needed to toggle the .* to ungreedy because “.*” also matches “After”:

/before(.*?)After/

If you know it is digits:

/before(\d*)After

If it could be any word characters (0-9, a-z, A-Z, _):

/before(\w*?)After