The Personal Web Pages of Chris X. Edwards

Regular Expression Tutorial

Existent Quantifier

In regular expressions, the "+" character is (or can be) a metacharacter with very similar properties to the comprehensive quantifier "*". The essential difference is that while the "*" matches zero or more atoms, the existent quantifier matches one or more. This means that there is no possibility that the character being modified could be optional. It must exist at least once.

Matches "OohAah", "OooooAah", "OohAaaaah", "OoooohAaaaah", etc, but not "OhAh".

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Chris X. Edwards ~ December 2003