s/\<\(RegularExpression\)s\>/\1/gp
See:
- AlternativesToRegularExpressions
- MasteringRegularExpressions
- RegularExpressionExamples
- RegularExpressionLibraries
- RegularExpressionMatchAssertion
- RegularExpressionsArent
- StructuralRegularExpressions
CategoryRegularExpressions CategoryRedirect