Description: ------------ $ in regex is interpreted as an reference to variable Test script: --------------- label = #[$a-zA-Z_\x7f-\xff][$a-zA-Z0-9_\x7f-\xff]*# Expected result: ---------------- I expected it to work. Actual result: -------------- PHP Notice: Undefined variable: a in /*/lexer.php on line 122 PHP Notice: Undefined variable: a in /*/lexer.php on line 122

Hey, Janusz, can you put together a small executable test script for us less familiar with the package?

lexer.plex: <?php class Lexer { private $data; private $N = 0; public $token; public $value; public $line = 1; function __construct($data) { $this->data = $data; } /*!lex2php %input {$this->data} %counter {$this->N} %token {$this->token} %value {$this->value} %line {$this->line} label = #[$a-zA-Z_\x7f-\xff][$a-zA-Z0-9_\x7f-\xff]*# */ /*!lex2php label {$this->token = 'LABEL';} */ } ?> test.php: <?php error_reporting(E_ALL); include 'lexer.php'; $lexer = new Lexer('$test'); $lexer->yylex(); echo $lexer->token, '(', $lexer->value, ')', PHP_EOL; ?> # plex lexer.plex # php test.php Expected output: LABEL($hehe) Actual output: PHP Notice: Undefined variable: a in /.../lexer.php on line 50 PHP Notice: Undefined variable: a in /.../lexer.php on line 50 PHP Fatal error: Uncaught exception 'Exception' with message 'Unexpected input at line1: $' in /.../lexer.php:137 Stack trace: #0 /.../lexer.php(21): Lexer->yylex1() #1 /.../test.php(7): Lexer->yylex() #2 {main} thrown in /.../lexer.php on line 137

the "$a" in the .plex file needs to be backquoted ie "\$a" plus the expected output really should be as follows: kguest@ubuntu:~$ php test.php LABEL($test)

Oh, as if I missed that one. Thanks for the test case Janusz, anyhow!

One \ before $ is ignored, and \\ is replaced to \\\\. The only way to use $ is \036. Also, I don't think that anybody will need access to PHP variables here. $ should automagically get escaped.

I agree, this is a bug