given below sample code
get => "hello#index" # comments
How to macth '# comments' ?
There is Ruby regular expression editor http://rubular.com/ for test.
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2 Answers
Assuming the unrealistic case in which you want to match any text at all after the last hash you can use
/#[^#]*$/
But there is no guarantee the last hash actually begins a comment. If a line had a hash inside a string literal or was itself used as a delimiter in a %w, for example
%w# abc def #
or was used in something like this
dog = "spike"
%w{#dog rat}
then you will have a difficult time trying to come up with a regex. I would go with a ruby parser.
2 Comments
qichunren
It sounds like I should use ruby synax parser to do this thing. I am writing a ruby obfuscator.
Ray Toal
Indeed. I do think a syntax parser is the only reliable way to remove comments given that the hash symbol can appear in many different contexts including in
#{} forms and string literals and %w{} forms for which I am not sure a regex is powerful enough in general (though it might be with some effort). The fact that you are writing an obfuscator, though, means you definitely want the full power of a parser so you can perform a wide variety of transforms. These transforms should be done on the abstract syntax tree rather than on the (linear) Ruby text./# comments/ would work fine
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