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Feature #11309

open

Iterator over string matches

Added by sawa (Tsuyoshi Sawada) almost 6 years ago. Updated almost 6 years ago.

Status:
Open
Priority:
Normal
Assignee:
-
Target version:
-
[ruby-core:69743]

Description

This was hinted from a problem in stackoverflow (http://stackoverflow.com/questions/31074050/build-list-of-strings-containing-substrings-separated-by-an-from-a-string/31075511#31075511).

Suppose there is a string:

s = "a_b_c_d_e"

To get an array of pre-matches that result from matching s with "_", I can do this:

a = []
s.scan("_"){a.push($`)}
a # => ["a", "a_b", "a_b_c", "a_b_c_d"]

But this looks too Perlish. I thought it would be nice if there is a method on String that creates an enumerator over matches so that I can do something like this:

"a_b_c_d_e".some_method("_").with_object([]){|m, a| a.push(m.post_match)}
# => ["a", "a_b", "a_b_c", "a_b_c_d"]

where m is the last matchdata instance at that point. I believe such method would have wider application.

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