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```
'bbbbbb' =~ /(?<=[^z]*a)b/
```
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```
'xiyjykz' =~ /(?<=x(.*)y(.*))z/s
```
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```
$1 = 'iyj';  $2 = 'k'
```
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```
$1 = 'i';  $2 = 'jyk'
```