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$input =~ /[0-9]/;
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```
$input =~ /\d/;
```
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```
21 
dfjdfkfjd2 
jf2kjf 
9343kfd2
```
Select or download this
```
$input =~ /^\D*\d\D*$/;
```
Select or download this
```
$input =~ /^\d$/
```