alpha-numeric String
What's the best way to check that a string is lower case and alpha-numeric?
I'm using
char[] ca = userName.toCharArray();
for (int i = 0; i < ca.length[]; i++)
{
if (!(ca[i] >= 48 && ca[i] <= 57) && !(ca[i] >= 97 && ca[i] <= 122))
{
// user name is not lower case alpha-numeric.
}
}
Is there a better way?
Thanks in advance,
Matt
[730 byte] By [
mattbunch] at [2007-9-26 2:18:47]
I got this off someone last week for checking alphanumeric'ness'.
you could add your lowercase check to this.
I think this doesn't work when the string is just spaces(i.e it incorrectly returns true)
public static boolean isStringAllLettersOrDigits(String aString)
{
int stringSize = aString.length();
for (int i = 0; i < stringSize; i++)
{
boolean check = Character.isLetterOrDigit(aString.charAt(i));
if (!check)
{
return false;
}
};
return true;
}
