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```
$str = 'aaaaa';
$str =~ s/a+/b/;
```

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$str1 = $str2 = '111b222c333c444';
$str1 =~ s/b.+c//;
# $str1 contains '111444'.
$str2 =~ s/b.+?c//;
# $str2 contains ''111333c444'.