$string = "ABC (Test1)";
echo preg_replace("/([^)]+)/","",$string); // 'ABC '
preg_replace
is a perl-based regular expression replace routine. What this script does is matches all occurrences of a opening parenthesis, followed by any number of characters not a closing parenthesis, and again followed by a closing parenthesis, and then deletes them:
Regular expression breakdown:
/ - opening delimiter (necessary for regular expressions, can be any character that doesn't appear in the regular expression
( - Match an opening parenthesis
[^)]+ - Match 1 or more character that is not a closing parenthesis
) - Match a closing parenthesis
/ - Closing delimiter
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