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How to block symbol in username

Please help guys. How to block symbol in username registeration only numbers and letters only. username min 3, max 8.. please give code work in mobilechat version php 5

15th Jan 2018, 6:37 PM
Weet Bokarachai
Weet Bokarachai - avatar
4 Answers
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Do you want to block to not write or to check username and give advise to the user when write symbols?
17th Jan 2018, 2:49 AM
Daniel
Daniel - avatar
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username registeration numbers and letters, min 3 max 8 length
18th Jan 2018, 7:48 AM
Weet Bokarachai
Weet Bokarachai - avatar
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yes but is not the same to check next to submit or in Real time dont let symbols
18th Jan 2018, 10:28 PM
Daniel
Daniel - avatar
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can you give code example?
19th Jan 2018, 7:50 AM
Weet Bokarachai
Weet Bokarachai - avatar