If they did, that is, if subject started with an opening parenthesis, the condition is TRUE, and so the yes-pattern is executed and a closing parenthesis isIf they did, that is, if subject started with an opening parenthesis, the condition is TRUE, and so the yes-pattern is executed and a closing parenthesis is required.
La deuxième partie recherche un séquence de caractères qui ne contiennent pas de parenthèses.