I don’t know why, but this behaviour is apparently by design:

A literal "{" should now be escaped in a pattern

If you want a literal left curly bracket (also called a left brace) in a regular expression pattern, you should now escape it by either preceding it with a backslash ("\{") or enclosing it within square brackets "[{]", or by using \Q; otherwise a deprecation warning will be raised. This was first announced as forthcoming in the v5.16 release; it will allow future extensions to the language to happen.

— perl5211delta#Deprecations

Presumably the planned “future extensions to the language” (whatever they are) won’t be affected by unescaped right braces.

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re: No need to escape right brace in regex by Athanasius
in thread No need to escape right brace in regex by syphilis

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