[racket] How write regexp for lexer

Валентин,
maybe this short example could help

http://pastebin.com/ncZpH49E

>
> Hello. I need write rule for lexer for recognize comment which begin from
> first column of line.
> I have next regexp for comment (:seq "//" (:* (:~ CR LF))), aftrer add
> cr/lf to begin of expression i write (:seq  LineTerminator (:* (:or
> #\space TAB FF)) "//" (:* (:~ CR LF))), but this regexp -first eat
> LineTerninator, second - don't recognize comment if it first in file
> Help me, please, write this rule
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