Accessing MatchData results in StringScanner

[Phrogz]

Is it possible using #scan or any other method of StringScanner to get
access to captured sub-expressions in the supplied regexp?

For example, something like:
ss = StringScanner.new( "Hello __World__" )

while ...
if md = ss.scan( /__([^_]+)__/ )
# I would like md to be a MatchData, not a String
# because I want access to the first capture;
# $1 (which I dislike on principle anyway) is not
# updated by the call to #scan
end
end


If the answer is 'no'...might this be a good addition? Perhaps as a new
method (in case returning a MatchData was much slower than a String)?

 

[Logan Capaldo]

Is it possible using #scan or any other method of StringScanner to get
access to captured sub-expressions in the supplied regexp?
=20
For example, something like:
ss =3D StringScanner.new( "Hello __World__" )
=20
while ...
if md =3D ss.scan( /__([^_]+)__/ )
# I would like md to be a MatchData, not a String
# because I want access to the first capture;
# $1 (which I dislike on principle anyway) is not
# updated by the call to #scan
end
end
=20
=20
If the answer is 'no'...might this be a good addition? Perhaps as a new
method (in case returning a MatchData was much slower than a String)?
=20
=20
=20

ss[1]

 

[Charles Mills]

Is it possible using #scan or any other method of StringScanner to get
access to captured sub-expressions in the supplied regexp?

For example, something like:
ss = StringScanner.new( "Hello __World__" )

while ...
if md = ss.scan( /__([^_]+)__/ )
# I would like md to be a MatchData, not a String
# because I want access to the first capture;
# $1 (which I dislike on principle anyway) is not
# updated by the call to #scan
end
end


If the answer is 'no'...might this be a good addition? Perhaps as a new
method (in case returning a MatchData was much slower than a String)?

Read the docs
http://www.ruby-doc.org/stdlib/libdoc/strscan/rdoc/classes/StringScanner.html
http://www.ruby-doc.org/stdlib/libdoc/strscan/rdoc/classes/StringScanner.html#M000039

use #[]
ss[1] is like $1

-Charlie

 

[Phrogz]

Thanks muchly (to Logan as well)!