Pattern compile(String) method in Java with Examples
The compile(String) method of the Pattern class in Java is used to create a pattern from the regular expression passed as parameter to method. Whenever you need to match a text against a regular expression pattern more than one time, create a Pattern instance using the Pattern.compile() method.
Syntax:
public static Pattern compile(String regex)
Parameters: This method accepts one single parameter regex which represents the given regular expression compiled into a pattern.
Return Value: This method returns the pattern compiled from the regex passed to the method as a parameter.
Exception: This method throws following exception:
- PatternSyntaxException: This exception is thrown if the expression’s syntax is invalid.
Below programs illustrate the compile(String) method:
Program 1:
Java
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
String REGEX = ".*www.*" ;
String actualString
= "www.geeksforgeeks.org" ;
Pattern pattern = Pattern.compile(REGEX);
Matcher matcher = pattern.matcher(actualString);
boolean matches = matcher.matches();
System.out.println( "actualString "
+ "contains REGEX = "
+ matches);
}
}
|
Output:
actualString contains REGEX = true
Program 2:
Java
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
String REGEX = "brave" ;
String actualString
= "Cat is cute" ;
Pattern pattern = Pattern.compile(REGEX);
boolean matches = pattern
.matcher(actualString)
.matches();
System.out.println( "actualString "
+ "contains REGEX = "
+ matches);
}
}
|
Output:
actualString contains REGEX = false
Reference: https://docs.oracle.com/javase/10/docs/api/java/util/regex/Pattern.html#compile(java.lang.String)
Last Updated :
03 Apr, 2023
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