Times we need to ensure the particular combinations of alphanumeric characters in String. For example, an employee Id, Student roll number or any department can be in the form of alphanumeric String. So here we are going to see a code sample which would help to determine if a string contains alphanumeric combination or not. We can also find the particular number of alphabets and numeric it contains. We will also look at the different ways to find alphabets and digits in String as well as count of them.
We have already covered the part where we saw the sample code to check if String contains only numeric digits or if String contains alphabets only . To do so, Java provides regular expressions using java.util.regex.Pattern and java.util.regex.Matchter class.
Sample code to Check if String contains alphanumeric in Java
And here is the output it provides :
What’s your approach to find the alphanumeric combinations ? Share in comments below.