Regex : Find a number between parentheses

Question

I need a regex who find the number in bold below :

20 (L.B.D.D. hello 312312) Potato 1651 (98)

20 (L.B.D.D. hello 312312 bu

Answer 1

This only matches 312312 in the first capture group:

^.*?\([^\d]*(\d+)[^\d]*\).*$

Regexplanation:

^        # Match the start of the line
.*?      # Non-greedy match anything
\(       # Upto the first opening bracket (escaped)
[^\d]*   # Match anything not a digit (zero or more)
(\d+)    # Match a digit string (one or more)
[^\d]*   # Match anything not a digit (zero or more)
\)       # Match closing bracket
.*       # Match the rest of the line
$        # Match the end of the line

See it here.