Regular expression matching alphanumeric only requiring both letters and numbers

Question

I want to match an alphanumeric string containing at least one letter and one number. Is there a simple way to combine the following into a single regular expression? ``` strValue.matches("[A-Z0-9]+") && strValue.matches(".*[A-Z].*") && strValue.matches(".*[0-9].*") ```

Accepted Answer

Use look ahead assertion.

```
strValue.matches("^(?=.*[A-Z])(?=.*\d)[A-Z\d]+$")
```

Regular expression matching alphanumeric only requiring both letters and numbers

Solution

Problem