GNU Smalltalk Library Reference: RegexResults-testing

ifMatched: oneArgBlock: If the regular expression was matched, pass the receiver to oneArgBlock and return its result. Otherwise, return nil.
ifMatched: oneArgBlock ifNotMatched: zeroArgBlock: If the regular expression was matched, evaluate oneArgBlock with the receiver as the argument. If it was not, evaluate zeroArgBlock. Answer the result of the block’s evaluation.
ifNotMatched: zeroArgBlock: If the regular expression was matched, return the receiver. If it was not, evaluate zeroArgBlock and return its result.
ifNotMatched: zeroArgBlock ifMatched: oneArgBlock: If the regular expression was matched, evaluate oneArgBlock with the receiver as the argument. If it was not, evaluate zeroArgBlock. Answer the result of the block’s evaluation.
matched: Answer whether the regular expression was matched