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perl -e '$x = "abcde";             $x =~ s/b../==${^MATCH}==/p;  print
+ "$x\n"'
perl -e '$x = "abcde"; $sub="b.."; $x =~ s/$sub/==${^MATCH}==/p; print
+ "$x\n"'

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```
a====e
a==bcd==e
```