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Program: Java regex with case insensitive.


Description:

We need to pass Pattern.CASE_INSENSITIVE constant to Pattern.compile() method, along with regular expression. This makes case insensitive matches.


Code:
package com.java2novice.regex;

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

public class MyPatternMatchCaseInsensitive {

	public boolean isPatternMatching(String line){
		
		Pattern ptn = Pattern.compile("java", Pattern.CASE_INSENSITIVE);
		Matcher mtch = ptn.matcher(line);
		if(mtch.find()){
			return true;
		}
		return false;
	}
	
	public static void main(String a[]){
		MyPatternMatchCaseInsensitive msp = new MyPatternMatchCaseInsensitive();
		System.out.println(msp.isPatternMatching("This line contains java, lets see"));
		System.out.println(msp.isPatternMatching("Here JAVA is in capital leters, lets see"));
		System.out.println(msp.isPatternMatching("Here C++ is in capital leters, lets see"));
	}
}

Output:
true
true
false
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I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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