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Stop Flex when first matching a TOKEN [message #1847960]

Mon, 15 November 2021 10:13

ksleini mikeisnie

Messages: 1
Registered: November 2021

Junior Member

I'm writing a flex/bison parser, and need to identify the following pattern using Flex:

begin
/*some code*/
end

The above pattern may appear a few times inside a code. For example:

begin
/*some code #1*/
end
/*some code #2*/
begin 
/*some code #3*/
end

It is important for me to identify the pattern in the lexer, but when using the following regex:

block "begin"[.\n]*"end"
{block} {return ID_BLOCK}

it catches the first begin and the LAST end. I would like to catch the first end. (please note#1: flex does not support all regex, so I cannot use regex zero length lookahead assertion please note #2: I think that the best way is to stop at the first match of "block" and not continue filling the buffer, I just dont know how to do it)

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