How can I verify if a string contains at least one number?

Federico Desia · Apr 1, 2019

Deleted User · Apr 2, 2019

You could do it with a regex

Code:

String line = "te5t";
Pattern r = Pattern.compile(".*[0-9].*");
Matcher m = r.matcher(line);
if (m.find( )) {
  System.out.println("It matched");
}

scary alien · Apr 2, 2019

+1 to LV

I've also used this method before:

public static boolean isNumeric(String str) {
try {
Double.parseDouble(str);
return true;
} catch(NumberFormatException e){
return false;
}
}

(taken from the excellent site: https://stackoverflow.com/questions/1102891/how-to-check-if-a-string-is-numeric-in-java that also has a lot more/other suggestions on how to accomplish this)

Cheers!

Deleted User · Apr 2, 2019

scary alien said:
+1 to LV

Thanks Scary. I have to give 0.5 of that to @GameTheory who put the idea of regex in my head with an answer to a recent question.