[ruby-core:77020] [Ruby trunk Feature#12694] Want a String method to remove heading substr

Issue #12694 has been updated by Nobuyoshi Nakada.


IIRC, there were proposals of `lstrip` and `rstrip` enhancement.
I'd expect them to accept char class(es), than a sub-string.

Note that `rb_str_index_m` accepts a `Regexp` too.
Calling `str_strlen` on it will segfault.


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Feature #12694: Want a String method to remove heading substr
https://bugs.ruby-lang.org/issues/12694#change-60247

* Author: Naotoshi Seo
* Status: Open
* Priority: Normal
* Assignee: 
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I often write codes like:

```ruby
str = 'abcdef'
substr = 'abc'
str[substr.size..-1] if str.index(substr) == 0 #=> 'def'
# or
str.sub(/^#{substr}/, '') #=> 'def'
```

I want a short hand which is something like:

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

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



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