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- qr/.{1,100}/i
- /p{ascii}+/
- print "String okay" unless /P{ascii}/
- /^[A-Za-z0-9_]*$/
- /^[^öäü]*$/
- Example:-
- sdddd -- allowing
- @xxx123 -- not allow
- abcdfe4 -- allow
- 123 ba xx -- allow
- pqrs_ -- Not allow
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