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$str = "234kjh23ljkgh34klj2345klj";
print $str."\n";
$str =~s/(?<=[a-z])(?=[0-9])|(?<=[0-9])(?=[a-z])/ /ig;
print $str."\n";

Success #stdin #stdout 0s 4552KB

stdin

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Standard input is empty

stdout

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234kjh23ljkgh34klj2345klj
234 kjh 23 ljkgh 34 klj 2345 klj

https://ideone.com/Gq61FQ

language:

Perl (perl 5.28.1)

created:

visibility:

public

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