Split a string after some specific sub-string in Java using regex

Question

String str = "FirstName LastName - 1234xx"

In above case, want to replace above string with everything after " - " substring. In the above example it would mean changing str to 1234xx

The length of string after " - " is not fixed, hence cannot just capture last certain no. of characters

This approach gives FirstName LastName - - instead of desired output 1234xx

public class StringExample 
{
    public static void main(String[] args) 
    {
        String str = "FirstName LastName - 1234xx";
        String newStr = str.replaceAll("(?<=( - )).*", "$1");

        System.out.println(newStr);
    }
}

Could you provide more cases? It seems substring after '-' and trimmed all spaces is okay. — Louis Go
– Louis Go, Commented May 27, 2020 at 5:57

Tim Biegeleisen · Accepted Answer · 2020-05-26 23:29:05Z

1

You were on the right track. Just use a lazy dot to consume everything up to and including the dash.

String str = "FirstName LastName - 1234xx";
String newStr = str.replaceAll("^.*-\\s*", "");

System.out.println(newStr);

answered May 26, 2020 at 23:29

Tim Biegeleisen

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5 Comments

Arpit Over a year ago

Thanks, one thing though. Want everything after " - " and not "-". How to include whitespaces before and after "-"? Want this test case to fail FirstName LastName-1234xx

Tim Biegeleisen Over a year ago

Yes, it still works with that input.

Arpit Over a year ago

Not want that case to work. Based on your answer, think this would be the right implementation "^.*( - )\\s*", "". Can you verify?

Tim Biegeleisen Over a year ago

instead of desired output 1234xx ... what is your desired output if not 1234xx ?

Arpit Over a year ago

My sub-string to check would be " - " and not "-". Want those white-spaces around dash, then split substring beyound that. Input FirstName LastName - 1234xx should yeild 1234xx while FirstName LastName-1234xx should yield same string FirstName LastName-1234xx.Could reach to my desired answer though. Thanks

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