Java 中的 Pattern pattern()方法，带示例
原文:https://www . geesforgeks . org/pattern-pattern-method-in-Java-with-examples/
Java 中模式类的模式()方法用于获取正则表达式，该表达式是为创建该模式而编译的。我们使用一个正则表达式来创建模式，这个方法用来获得相同的源表达式。
语法:
public String pattern()
参数:这个方法不接受任何东西作为参数。
返回值:这个方法返回模式的源正则表达式。
下面的程序说明了模式()方法: 程序 1:
// Java program to demonstrate
// Pattern.pattern() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// create a REGEX String
String REGEX = "(.*)(for)(.*)?";
// create the string
// in which you want to search
String actualString
= "code of Machine";
// create pattern
Pattern pattern1 = Pattern.compile(REGEX);
// find the regular expressio of pattern
String RegularExpression = pattern1.pattern();
System.out.println("Pattern's RegularExpression = "
+ RegularExpression);
}
}
Output:
Pattern's RegularExpression = (.*)(for)(.*)?
程序 2:
// Java program to demonstrate
// Pattern.compile method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// create a REGEX String
String REGEX = "(.*)(ee)(.*)?";
// create the string
// in which you want to search
String actualString
= "geeks";
// create pattern
Pattern pattern1 = Pattern.compile(REGEX);
// find the regular expressio of pattern
String RegularExpression = pattern1.pattern();
System.out.println("Pattern's RegularExpression = "
+ RegularExpression);
}
}
Output:
Pattern's RegularExpression = (.*)(ee)(.*)?
参考文献: https://docs . Oracle . com/javase/10/docs/API/Java/util/regex/pattern . html # pattern()
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