Retrieve a Sub-string from a string after the first occurrence of a character from a range of characters

i am trying to retrieve a sub-string from a string from the first occurence of any character between A-Z and a-z

for example:

if the string is 13BHO1234FO

then substring should be BHO1234FO

i.e the string from the first occurence of the character 'B'.

Try this. It simply deletes the first part of the string you don't want and returns the rest. The original string is unchanged.

String[] testCases =
		{ "13BHO1234FO", "ARSTOP123!", "133KSLK", "122222" };

for (String s : testCases) {
	String sub = s.replaceFirst("^[^A-Za-z]+", "");
	System.out.println("'" + sub + "'");
}

Prints substrings surrounded by single quotes to show the string.

'BHO1234FO'
'ARSTOP123!'
'KSLK'
''

You can use a regex and Matcher to find the index of the first alphabetical character and make a substring starting from the index:

import java.util.regex.*;
class Main {
    public static void main(String[] args) {
        String text = "13BHO1234FO";
        Pattern pattern = Pattern.compile("[A-Za-z]");
        Matcher matcher = pattern.matcher(text);
        matcher.find();
        int index = matcher.start();
        String substr = text.substring(index);
        System.out.println(substr);
    }
}

Try this one:

public static void main(String[] args) {
    String test = "13BHO1234FO";
    System.out.println(test.replaceFirst("^.*?(?=[A-Za-z])", ""));
}