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[racket-dev] How to represent the startline in Lexer SRE Operators ??

From: jenny sun (jenny.sun.jenny.sun at gmail.com)
Date: Thu Jan 27 13:45:32 EST 2011		 
Hi, does anybody know how to represent the startline with whitespace,
in lex, we can write, means that I only match the spaces from the start
line...
^[ ]*

But, there is no ^ operator in Lexer SRE Operators ???

Thanks
--jenny
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