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// predicates
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NSPredicate *nameTest;
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NSPredicate *mailTest;
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nameTest = [[NSPredicate predicateWithFormat:@"SELF MATCHES %@", @"[a-zA-Z0-9_]{5,}"] retain];
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mailTest = [[NSPredicate predicateWithFormat:@"SELF MATCHES %@", @"[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+(\\.[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+)*@([a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,6}"] retain];
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BOOL isNameOK=[nameTest evaluateWithObject:txtSignUpUserName.text];
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BOOL isEmailOK=[mailTest evaluateWithObject:txtSignUpEmail.text];