automaton interpreter C character class s control flow default action s deterministic finite automaton end of line s finite automaton host language s input pointer s input stream s input string s left context s lexical rules longest match s newline character s parser generator g program fragments s regular expression start condition s text character s trailing context s Lex \(em A Lexical Analyzer Generator g general format s Regular Expressions Actions Ambiguous Source Rules Source Definitions s Usage s \*L and yacc s Left Context Sensitivity Character Set s Caveats and Bugs s I input S I output S unput S yylex S yymore S yywrap S yyless S $ S %% S %{ S %} S ECHO S REJECT S / operator p ^ operator p action s Arbitrary character s Optional expressions s Repeated expressions s Alternation and Grouping s Context sensitivity Repetitions and Definitions s yacc C lexical analyzer g Summary of Source Format s operators s Ratfor 0 BEGIN S %start S %T S yyleng S yytext S comments s character set table s lex.yy.c S -ll S -ly S C escapes s internal array sizes s