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Feature #12694

Updated by sonots (Naotoshi Seo) over 3 years ago

I often write codes like: 

 ```ruby 
 str = 'abcdef' 
 substr = 'abc' 
 str[substr.size..-1] if str.start_with?(substr) #=> 'def' 
 # or 
 str.sub(/\A#{Regexp.escape(substr)}/, str.sub(/^#{Regexp.escape(substr)}/, '') #=> 'def' 
 ``` 

 I want a short hand which is something like: 

 ```ruby 
 str = 'abcdef' 
 substr = 'abc' 
 str.lstrip(substr) #=> 'def' 
 ``` 

 Having similar argument for `String#rstrip` would be nice for symmetry although we already have `String#chomp(substr)` 

 My frequent use-case is coming from fluentd. We have `remove_tag_prefix` option to remove a heading substring from a tag. We currently using `String#sub` with a regular expression, but I feel regular expression matching is too much just to remove a heading substring. https://github.com/fluent/fluentd/blob/75005f18d48ed3d416890413fa5f83982b264c71/lib/fluent/compat/handle_tag_name_mixin.rb#L45

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