lex – generator of lexical analysis programs|
lex [ −tvn9 ] [ file ... ]|
Lex generates programs to be used in simple lexical analysis of
text. The input files (standard input default) contain regular
expressions to be searched for and actions written in C to be
executed when expressions are found.
A C source program, lex.yy.c is generated. This program, when
run, copies unrecognized portions of the input to the output,
and executes the associated C action for each regular expression
that is recognized.
The options have the following meanings.|
−t Place the result on the standard output instead of in file lex.yy.c.
−v Print a one-line summary of statistics of the generated analyzer.
−n Opposite of −v; −n is default.
−9 Adds code to be able to compile through the native C compilers.
This program converts upper case to lower, removes blanks at the
end of lines, and replaces multiple blanks by single blanks.
[ ]+ putchar(' ');
M. E. Lesk and E. Schmidt, ‘LEX--Lexical Analyzer Generator’, Unix
Research System Programmer’s Manual, Tenth Edition, Volume 2.
Cannot handle UTF.
The asteroid to kill this dinosaur is still in orbit.|