public RegexMatcher addExpression ( String expr , T attach , Option ... options ) { if ( nfa == null ) { nfa = parser . createNFA ( nfaScope , expr , attach , options ) ; } else { NFA < T > nfa2 = parser . createNFA ( nfaScope , expr , attach , options ) ; nfa = new NFA <> ( nfaScope , nfa , nfa2 ) ; } return this ; }
Add expression .