Flex regular expression problems

kpetrov@jagor.srce.hr (Omadon)
9 Apr 1999 14:08:17 -0400

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Flex regular expression problems kpetrov@jagor.srce.hr (1999-04-09)
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From: kpetrov@jagor.srce.hr (Omadon)
Newsgroups: comp.compilers
Date: 9 Apr 1999 14:08:17 -0400
Organization: FER
Keywords: lex, question

I'm having problems defining a flex regular expression for line numbers for
a BASIC-like language.


I define the reg. expression for line numbers:


^[[:space:]]*[0-9]+ { out_word("LINENUM"); }


This works when the line number is at the beginning of the text line, but
if I have some spaces before the line number the lexer jams.


10 for blah blah <- this works


          10 for blah... <- this jams the scanner


HELP!!!

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