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About Ilias Tsagklis

Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

Remove line termination characters from string

In this example we shall show you how to remove line termination characters from a String, using regular expressions. To remove line termination characters from a String one should perform the following steps:

  • Create a String that contains a line separator as specified by the System.getProperty(String key) API method.
  • Compile a String regular expression to a Pattern, using compile(String regex) API method of Pattern.
  • Use matcher(CharSequence input) API method of Pattern to create a Matcher that will match the given String input against the first pattern and the second pattern.
  • Use replaceAll(String replacement) API method to replace every subsequence of the input sequence that matches the pattern with the given replacement string,

as described in the code snippet below.  

package com.javacodegeeks.snippets.core;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RemoveLineTerminationCharactersFromString {
	
	public static void main(String[] args) {
		
		String input = "This is the original String." +
			System.getProperty("line.separator") + "This will be converted to a single line.";
		System.out.println("Original String:");
		System.out.println(input);
		
		System.out.println();
		
		String patternStr = "r?n";
	    String replaceStr = " ";
	    
	    Pattern pattern = Pattern.compile(patternStr);
	    Matcher matcher = pattern.matcher(input);
	    
	    input = matcher.replaceAll(replaceStr);
		System.out.println("Modified String:");
		System.out.println(input);
		
	}

}

Output:

Original String:
This is the original String.
This will be converted to a single line.

Modified String:
This is the original String. This will be converted to a single line.

  
This was an example of how to remove line termination characters from a String, using regular expressions in Java.

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