There is a difference. The OP uses /i. If $string has the UTF-8 flag set both â and  will match $r = chr 226; s/$r/'/ig;. And if UTF-8 isn't set, there still may be a locale that plays a role.

In reply to Re^2: Using 'ord' in a regular expression for substitution by JavaFan
in thread Using 'ord' in a regular expression for substitution by Anonymous Monk

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