How to create a regex for accepting only alphanumeric characters? [duplicate]

Question

Possible Duplicate:
Regular Expression for alphanumeric and underscores

How to create a regex for accepting only alphanumeric characters?

Thanks.

Answer 1

Try below Alphanumeric regex

"^[a-zA-Z0-9]*$" 

^ - Start of string

[a-zA-Z0-9]* - multiple characters to include

$ - End of string

See more: http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html

Answer 2

[a-zA-Z0-9] will only match ASCII characters, it won't match

String target = new String("A" + "\u00ea" + "\u00f1" +                              "\u00fc" + "C"); 

If you also want to match unicode characters:

String pat = "^[\\p{L}0-9]*$";