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Need help on Unique Javascript validation

 
Avinash Talari
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Posts: 3
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Please help me in writing a javascript to validate string of the format "A23d:1234". First four digits of alphanumeric characters and then a colon and then four numeric characters. I am inputting 5 different strings of this format into a text area which has 5 rows ..each limited to 9 characters. If the format fails for any of the row an alert should be thrown. I am trying to use the substring function but facing issues in validating the string of each row.
 
Bear Bibeault
Author and ninkuma
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Use a regular expression.
 
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