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The difference between back-references and global variables in Ruby regexp

by Maciej Malecki —

Use back-references for processing strings within the gsub method call. Choose global variables when using a block instead of a replacement argument, or if the regexp call is before manipulating with the result.

https://shellycloud.com/blog/2015/03/the-difference-between-backreferences-and-global-variables-in-ruby-regex

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