Regex :: Flex - Matching Strings That Begin And End With The Same Character
Oct 28, 2009
I need to match a string that begins and ends with the same character in flex...I know the long hand way (RE being - "a[^(a")]a" | "b[^(b")b" | etc...), but I'm positive this isn't what I'm required to do (midterm tomorrow!);
I need to do this in flex, but if you can think of a short regex for it, I may be able to convert it to flex notation.
What I was thinking of was something along the lines of -
%%
int firstChar;
%x string;
%%
[Code].....
But this bugs me in a few ways, first, having that variable makes this not a regular language; second, I don't know if you can even use a variable to in a pattern match; and third, I don't know how NOT to match it, if it's just a normal string. And third, I don't know how to return everything that's been matched while in 'string'
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