Matcher 在 Java 中使用 Pattern(模式)方法，示例
原文:https://www . geesforgeks . org/matcher-usepatternpattern-method-in-Java-with-examples/
使用匹配器类的 usePattern() 方法获取该匹配器要匹配的模式。
语法:
public Matcher usePattern(Pattern newPattern)
参数:该方法取一个参数新花样，即需要设置的新花样。
返回值:该方法返回一个带有新花样的匹配器。
异常:如果 newPattern 为空，该方法抛出 IllegalArgumentException 。
下面的例子说明了 Matcher.usePattern()方法:
例 1:
// Java code to illustrate usePattern() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "Geeks";
// Create a pattern from regex
Pattern pattern
= Pattern.compile(regex);
// Get the String to be matched
String stringToBeMatched
= "GeeksForGeeks";
// Create a matcher for the input String
Matcher matcher
= pattern
.matcher(stringToBeMatched);
// Get the new Pattern
String newPattern = "GFG";
// Get the Pattern using pattern method
System.out.println("Old Pattern: "
+ matcher.pattern());
// Set the newPattern using usePattern() method
matcher = matcher
.usePattern(
Pattern
.compile(newPattern));
// Get the Pattern
// using pattern method
System.out.println("New Pattern: "
+ matcher.pattern());
}
}
输出:
Old Pattern: Geeks
New Pattern: GFG
例 2:
// Java code to illustrate usePattern() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "GFG";
// Create a pattern from regex
Pattern pattern
= Pattern.compile(regex);
// Get the String to be matched
String stringToBeMatched
= "GFGFGFGFGFGFGFGFGFG";
// Create a matcher for the input String
Matcher matcher
= patter
n.matcher(stringToBeMatched);
// Get the new Pattern
String newPattern = "Geeks";
// Get the Pattern using pattern method
System.out.println("Old Pattern: "
+ matcher.pattern());
// Set the newPattern using usePattern() method
matcher = matcher
.usePattern(
Pattern
.compile(newPattern));
// Get the Pattern
// using pattern method
System.out.println("New Pattern: "
+ matcher.pattern());
}
}
输出:
Old Pattern: GFG
New Pattern: Geeks
参考: 甲骨文文档
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