Java Pattern compile() Method

The compile() method of Pattern class is used to compile the given regular expression passed as the string. It used to match text or expression against a regular expression more than one time.

Signature

SN	Method	Description
1	static Pattern compile(String regexp)	Return compiled version of a regular expression into the pattern.
2	static Pattern compile(String regexp, int flags)	Return compiled version of a regular expression into the pattern with the given flag.

Parameter

regexp - The expression that we want to compile.

flags - Match flags, a bit mask that may include

 CASE_INSENSITIVE, MULTILINE, DOTALL, UNICODE_CASE, CANON_EQ, UNIX_LINES, LITERAL, UNICODE_CHARACTER_CLASS and COMMENTS

Returns

The given regular expression compiled into a pattern

Throws

PatternSyntaxException - If the expression's syntax is invalid

Example 1

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PatternCompileExample1 {
public static void main(String[] args) {
		// TODO Auto-generated method stub
		//pattern/expression to be match
		Pattern  p=Pattern.compile("@gmail"); 
		//Regular expression
		Matcher m=p.matcher("abc@gmail.com");
		if(m.find())
		System.out.println(" Result :  "+m);
	}
 }

Test it Now

Output:

Result :  java.util.regex.Matcher[pattern=@gmail region=0,13 lastmatch=@gmail]

Example 2

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PatternCompileExample2 {
public static void main(String[] args) {
	int count=0;
	//pattern/expression to be match
	Pattern  p=Pattern.compile("@gmail"); 
	//Regular expression
	Matcher m=p.matcher("abc@gmailabc@gmail126@gmail.com");
	while(m.find())// finding pattern in regular expression
	{
	count =count+1;
System.out.println(" Start : "+m.start()+", End : "+m.end()+" Pattern group : "+m.group());
	}
	System.out.println(" number of Matches:  "+count);
	}
 }

Test it Now

Output:

Start : 3, End : 9 Pattern group : @gmail
 Start : 12, End : 18 Pattern group : @gmail
 Start : 21, End : 27 Pattern group : @gmail
 number of Matches:  3

Example 3

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PatternCompileExample3 {

	public static void main(String[] args) {

				//pattern/expression to be match 
				Pattern  p=Pattern.compile("@Gmail",Pattern.CASE_INSENSITIVE ); 
				//Regular expression
				Matcher m=p.matcher("abc@gmail.com");
				if(m.find())
				System.out.println(" Result :  "+m);				
	} 
}

Test it Now

Output:

Result :  java.util.regex.Matcher[pattern=@Gmail region=0,13 lastmatch=@gmail]

Example 4

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

public class PatternCompileExample4{

	public static void main(String[] args) {

	int c1=0;
	//pattern/expression to be match
Pattern  p1=Pattern.compile("\u00de",Pattern.MULTILINE
					|Pattern.UNICODE_CASE
					|Pattern.CASE_INSENSITIVE
					|Pattern.COMMENTS); 
		//Regular expression
		Matcher m1=p1.matcher("\u00fE \n \u00fe ");
		while(m1.find())// finding pattern in regular expression
		{
		c1 =c1+1;
	System.out.println(" Start : "+m1.start()+", End : "+m1.end()+" Pattern group : "+m1.group());
		}
		
		System.out.println(" number of Matches:  "+c1);
	}

}

Test it Now

Output:

Start : 0, End : 1 Pattern group : �
 Start : 4, End : 5 Pattern group : �
 number of Matches:  2

Next TopicJava Regex

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Java Pattern Class

Java Pattern compile() Method

Signature

Parameter

Returns

Throws

Example 1

Example 2

Example 3

Example 4

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