Bug #19763: Inconsistent error message for String#index vs String#rindex

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: 3.3.0
• Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN

[itarato (Peter Arato)]

String#index and String#rindex yields different error messages when used with a Regexp argument:

'abc'.force_encoding("ISO-2022-JP").index(/わ/)

Prints: incompatible character encodings: ISO-2022-JP and UTF-8 (Encoding::CompatibilityError)

'abc'.force_encoding("ISO-2022-JP").rindex(/わ/)

Prints: incompatible encoding regexp match (UTF-8 regexp with ISO-2022-JP string) (Encoding::CompatibilityError)

Looking at a few other use cases (eg String#byteindex, String#byterindex) Ruby seems to use the message incompatible encoding regexp match when encoding is checked between a String and a Regexp instance. Is this a bug for String#index?

[nobu (Nobuyoshi Nakada)]

https://github.com/ruby/ruby/pull/8045

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset git|e2257831ab20915b839eeaff79c6ec45b498de77.

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[Bug #19763] Raise same message exception for regexp