flex - Lexical Analysis

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In this video, I explain flex, a very useful tool in compiler-construction, for doing phase 1 (lexical analysis / tokenization) of a source code
  1. Write your own Operating System
  2. flex
  3. programming
  4. compiler
  5. compiler construction
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Комментарии
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Please more videos like this on the domain of compilers, maybe a "Compilers from scratch" like like the Linux from Scratch series!

mayanksharma
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Thanks so much. You are the first person to show how to compile flex and run it on simple example that I found <3

tobiaszwojnar
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Great video !! It cleared up so many flex concepts for me, and actually got me past my fear of using flex, because I used to think it was too complicated for me.

averageyoutubeenjoyer
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This is awesome. Subbed! Keep up the excellent work!

farhanyousaf
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18:30. What he's talking about is something that is called `greedy matching` in some places. I.e the longest pattern is what's matched first. It is how a compiler/regex can differentiate `==` from `=` . The longer one is checked for first.

shiewhun
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I have implemented lexer using same way as you said even the code is same but it is throwing error :
markdown_lexer.l:12:4: error: type name requires a specifier or qualifier
^#{1}[ \t]+.*$ { Token(H1) }
^
markdown_lexer.l:12:4: error: expected expression
2 errors generated.
make: *** [markdown_lexer.o] Error 1
rm markdown_lexer.cpp
What should I do to resolve this issue :( Please help

divyanshudwivedi
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''in a much more FLEXible way'' i see what you did there

abadlibadreddine
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Flex hat doch nichts mit "flexible" zu tun, sondern heißt "Fast LEXer"

HorstChristophSchreiber