Grep method for String

StringGrep.groovy

String.metaClass.grep = { pattern, cl ->
    def matcher = delegate =~ pattern
    if (matcher.find()) {
        cl.doCall(*matcher.collect { it })
    }
}
def address = 'Beverly Hills, 90210'.grep(/([\w\s]+),\s*(\d+)/) { match, city, zip ->
   [city: city, zip: zip]
}
assert address == [city: 'Beverly Hills', zip: '90210']