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Bug #17120
closedString#start_with? return wrong result for Regexp patterns containing /\K/
Status:
Rejected
Assignee:
-
Target version:
-
ruby -v:
ruby 2.8.0dev (2020-08-13T01:14:20Z master 69b5241c36) [x86_64-linux]
Description
String#start_with?
unexpectedly reports true when the pattern Regexp contains /\K/
(lookbehind) operator and the lookbehind pattern matches the beginning of self
.
"hello".start_with?(/h\Ke/) # => true (unexpected)
In this example, /h\Ke/
matches "hello", but it's not considered as a match at the beginning of the string by the other Regexp operations (e.g. $~.begin(0) == 1
).
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