How to check whether a string contains at least one alphabet in java?

The regular expression you want is [a-zA-Z], but you need to use the find() method.

This page will let you test regular expressions against input.

Regular Expression Test Page

and here you have a Java Regular Expressions tutorial.

Java Regular Expressions tutorial

You can use .*[a-zA-Z]+.* with String.matches() method.

boolean atleastOneAlpha = s.matches(".*[a-zA-Z]+.*");