question: public static CustomFormat createInstance ( String pattern , Map < String , String > regexMap ) { CustomFormat format = new CustomFormat ( ) ; format . m_nameList = extractNames ( pattern ) ; format . m_nameSet = new HashSet < String > ( format . m_nameList ) ; format . m_pattern = pattern ; Map < String , String > varMap = new HashMap < String , String > ( ) ; for ( String name : format . m_nameSet ) { String regex = String . format ( "(%s)" , regexMap . containsKey ( name ) ? regexMap . get ( name ) : VALUE_REGEX ) ; varMap . put ( name , regex ) ; } format . m_regex = StrSubstitutor . replace ( pattern , varMap ) ; return format ; }
target:  Create a CustomFormat with custom regular expressions for some variables