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I have an input field which is localized. I need to add a validation using a regex that it must take only alphabets and numbers. I could have used [a-z0-9] if I were using only English.
As of now, I am using the method Character.isLetterOrDigit(name.charAt(i)) (yes, I am iterating through each character) to filter out the alphabets present in various languages.
Are there any better ways of doing it? Any regex or other libraries available for this?
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In order to verify that the string only contains letters, numbers, underscores and dashes, we can use the following regex: "^[A-Za-z0-9_-]*$".
To validate a RegExp just run it against null (no need to know the data you want to test against upfront). If it returns explicit false ( === false ), it's broken. Otherwise it's valid though it need not match anything. So there's no need to write your own RegExp validator.
[A-Za-z] will match all the alphabets (both lowercase and uppercase).
boolean foundMatch = name.matches("[\\p{L}\\p{Nd}]*");
should work.
[\p{L}\p{Nd}] matches a character that is either a Unicode letter or digit. The regex .matches() method ensures that the entire string matches the pattern.
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