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Using lex/flex for lexing

Have you taken a look at lex/flex? I've found it to be an awesome tool for writing lexers.

You basically give it a bunch of regular expressions and a chunk of code to run when that regex is matched. There's some other fancy stuff it can do like pushing/popping and transitioning between states if you feel like it.

If you're on a Linux/OS X system with a compiler installed, flex is probably installed too. Not sure about Windows.

Here's an example:

https://github.com/slash-lang/slash/blob/master/src/lex.yy

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