question: checks if a given string is a valid person phone number . concode_field_sep String MESSAGE_PHONE_CONSTRAINTS concode_elem_sep String PHONE_VALIDATION_REGEX concode_elem_sep boolean isPrivate concode_elem_sep String EXAMPLE concode_elem_sep String value concode_field_sep int hashCode concode_elem_sep boolean equals concode_elem_sep String toString concode_elem_sep boolean isPrivate
target: boolean function ( String arg0 ) { return arg0 . matches ( PHONE_VALIDATION_REGEX ) ; }