regex - java use Regular Expressions to generate a string

i want to generate random String who have this form

[A-Za-z0-9]{5,10}

I don't have any idea how to do it, i should use regular expressions or random function ?

Answer

I'd stick to a Java-solution in this case, something along the lines of:

private String allowedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGRHIJKLMNOPQRSTUVWXYZ0123456789";


public String getRandomValue(int min, int max) {
    Random random = new Random();
    int length = random.nextInt(max - min + 1) + min;
    StringBuilder sb = new StringBuilder();
    for(int i = 0; i < length; i++) {
        sb.append(allowedChars.charAt(random.nextInt(allowedChars.length())));
    }
    return sb.toString();
}

You can call this with getRandomValue(5, 10);

I have not tried this code, since I have no IDE available

Note, if you're not apposed to using third party libraries, there are numerous available.