From: Eric Wong <normalperson@...>
Date: 2016-11-21T21:50:34+00:00
Subject: [ruby-core:78239] Re: [Ruby trunk Feature#12964] Add sub? and gsub? method to string class.

lachlan@wilgerfamily.com wrote:
> The sub? and gsub? method would allow you to check if you can
> sub or gsub the string.

We already added Regexp#match? for Ruby 2.4 to check this.


Fwiw, I prefer to use bang methods if the substitution is likely;
and maybe String#dup if the original needs to be preserved[*].

	if foo.sub!(/^something /, '')
	  ...
	end

[*] Strings are copy-on-write in MRI, so at most you allocate
    one object and copy 40 bytes if no substitution is possible.

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