I'm struggling to come up with the correct regular expression for validating input. It seems like it should be simple, but I'm still encountering a few issues.
The desired input format should be: "tests.xxxxxxx" where the x's can be any alphanumeric character. The only non-alphanumeric character is the period that separates 'tests' from the rest of the string.
(tests\.){1}
For validation, you can make use of the regex pattern along with the test() method:
check\.[a-zA-Z0-9]+
Note: To ensure only one occurrence of check, consider using a lookahead:
check\.(?!.*check)[a-zA-Z0-9]+
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