check if the passed regular expression is invalid . note : this method may be a performance killer , as it calls pattern #compile string each time , which is cpu intensive and has asynchronization penalty . concode_field_sep RegExHelper s_aInstance concode_field_sep List<String> getSplitToList concode_elem_sep List<String> getSplitToList concode_elem_sep String[] getAllMatchingGroupValues concode_elem_sep Matcher getMatcher concode_elem_sep Matcher getMatcher concode_elem_sep boolean stringMatchesPattern concode_elem_sep boolean stringMatchesPattern concode_elem_sep String[] getSplitToArray concode_elem_sep String[] getSplitToArray concode_elem_sep String getAsIdentifier concode_elem_sep String getAsIdentifier concode_elem_sep String getAsIdentifier concode_elem_sep String stringReplacePattern concode_elem_sep String stringReplacePattern
boolean function ( @ Nonnull @ RegEx final String arg0 ) { try { Pattern . compile ( arg0 ) ; return true ; } catch ( final PatternSyntaxException loc0 ) { return false ; } }