Remove any string from a variable

[Gintaras]

Use replacerx or findrx.

Code:

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str s="Balance (100)"
s.replacerx(".+?(\d+).*" "$1" 4)
out s

Here ".+?(\d+).*" ir regular expression.
.+? is 1 or more any characters. Matches "Balance (".
\d+ is 1 or more digits. Matches "100".
() marks the part of the string that can be specified as $1 in the replacement string.
.* is 0 or more any characters. Matches ")".