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How to check if a string is strictly alphanumeric java

How to check if a string is strictly alphanumeric java. I am getting the pattern as below to check but its not working


Pattern p = Pattern.compile("[a-zA-Z0-9]");
return p.matcher(data).find()

How to make it work

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It's having a small mistake, check below code for reference:


Pattern p = Pattern.compile("[^a-zA-Z0-9]");
return p.matcher(data).find()
Answer is