How to modify a regular expression to search between a special string and a character?

I’m trying to write a regular expression to search between a special string and a character.

I have a regular expression:

b(\(.*?)\)

It looks for matches between "b(" and ")", for example:
String: az[b('0x611', '0*L3')]
Match: b('0x611', '0*L3')

But sometimes there are lines like this:
String: (G, f[b('0x4ed', 'S)Oi')])

And in this case match will be: b('0x4ed', 'S), and that wrong.

I’m trying to solve this by looking for matches between "b(‘0x4ed’, ‘S)" and ")", but when I try to bring the regular expression to the following form b('0x4ed', 'S)(\(.*?)\), it stops working.

How could I get out of this situation?

>Solution :

Use: "not one or more singlequotes until a singlequote" like: '[^']+'

Example

b\('[^']+', ?'[^']+'\)

Demo on Regex101.com

PS: if the value can be empty '' use zero-or-more *:

b\('[^']+', ?'[^']*'\)