How do you use regular expressions to check if a String in Java ends with at least one digit?

Question

I try to use the regex to check the username should start with letters and ends with at least one digit, but the following code only allows me to end with 1 digit, and I'm not sure about whether I used the * correctly, I think "[regex]*" means match at least one times [regex]

if( username.matches("^[a-zA-z]*\\d*$") ){
System.out.println("The username is valid");

}
else{
System.out.println("The username is invalid");

}

[Also, your code works fine for me for more than 1 digit.](https://ideone.com/ONuI36) — Sotirios Delimanolis, Apr 09 '14 at 01:18
As listed at the bottom of the [StackOverflow Regular Expression FAQ](http://stackoverflow.com/a/22944075/2736496), under "Non-stackoverflow references: Tools (testers and explainers) > Online testers", there are many online resources where you can try things out yourself. — aliteralmind, Apr 09 '14 at 01:19

score 2 · Accepted Answer · answered Apr 09 '14 at 01:25

2

You were close:

^[a-zA-z]+[\d]+$

^[a-zA-z]+ make sure there is at least one character at the beginning of the string.

[\d]+$ make sure there is at least one digit at the end.

answered Apr 09 '14 at 01:25

Dan Harms

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How do you use regular expressions to check if a String in Java ends with at least one digit?

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