Elisp: get word(s) from an re-match

Elisp: get word(s) from an re-match

[Glen Stark]

Hi everyone, I guess this is pretty trivial, but I'm struggling a 
little.  Consider the following:

for ( Foo::iterator itr = foo.begin() ;  itr != foo.end(); ++foo)

I want to to a regex search within elisp for this pattern, and extract 
into variables "foo" and "itr".

The goal is to write a refactoring script that takes old iterator loops 
and replaces them with for (auto x : foo), so I'd like to have the name 
of itr and the object being iterated over.

I'm competent enough with regex's to write the regex, and replace with \1 
and \2, which would get me through the auto statement, but I want to 
store the name of itr in a variable, so I can replace occurences of itr  
in the body of the code with the new auto variable.

Can somone point me in the right direction?  A simple example that 
extracts a string out of a regex match and returns it into a variable 
would be fantastic.

Many thanks,

Glen

Re: Elisp: get word(s) from an re-match

[tomas]

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On Thu, Mar 26, 2015 at 01:20:57PM +0000, Glen Stark wrote:
> Hi everyone, I guess this is pretty trivial, but I'm struggling a 
> little.  Consider the following:
> 
> for ( Foo::iterator itr = foo.begin() ;  itr != foo.end(); ++foo)
> 
> I want to to a regex search within elisp for this pattern, and extract 
> into variables "foo" and "itr".

You want to look into the function match-data abd friends.

For example, (match-string 3) gives you the part matched by the third
parenthesis in your regexp in the current buffer (if you're matching
against a string `str', you'd have to write (match-string 3 str).

Note that this gets you the text properties too - if you want to have
them filtered, you'd use (match-string-no-properties ...).

Hope that helps.
- -- t
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