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/(?{"{"}})/ # Check it outside of eval too
EXPECT
-Unmatched right bracket at (re_eval 1) line 1, at end of line
+Unmatched right curly bracket at (re_eval 1) line 1, at end of line
syntax error at (re_eval 1) line 1, near ""{"}"
Compilation failed in regexp at - line 1.
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