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Regular Expression
r"
^\*?(\d{1,8})\*?$
"
Input 1
1
New
Valid results 12345678 87654321 1112223* 12* 1345* *123456* *1234567 *1* Invalid results 1234567 A 12- 12@ ** **1234** &T( * *1*2* 89789A8
Substitution
Valid results 12345678 87654321 1112223* 12* 1345* *123456* *1234567 *1* Invalid results 1234567 A 12- 12@ ** **1234** &T( * *1*2* 89789A8