Java 中 Matcher replaceAll(String)方法示例
原文:https://www . geesforgeks . org/matcher-replace all string-in-Java-method-with-examples/
匹配器类的替换所有(字符串)方法表现为一种追加和替换方法。此方法读取输入字符串，并用匹配器字符串中匹配的模式替换它。
语法:
public String replaceAll(String stringToBeReplaced)
参数:该方法取一个参数 stringToBeReplaced ，即匹配器中要替换的字符串。
返回值:该方法返回一个字符串，目标字符串通过替换字符串来构造。
下面的例子说明了 Matcher.replaceAll()方法:
例 1:
// Java code to illustrate replaceAll() 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 Geeks for For Geeks Geek";
// Create a matcher for the input String
Matcher matcher
= pattern.matcher(stringToBeMatched);
System.out.println("Before Replacement: "
+ stringToBeMatched);
// Get the String to be replaced
String stringToBeReplaced = "GFG";
StringBuilder builder
= new StringBuilder();
// Replace every matched pattern
// with the target String
// using replaceAll() method
System.out.println("After Replacement: "
+ matcher
.replaceAll(stringToBeReplaced));
}
}
输出:
Before Replacement: GeeksForGeeks Geeks for For Geeks Geek
After Replacement: GFGForGFG GFG for For GFG Geek
例 2:
// Java code to illustrate replaceAll() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "(FGF)";
// Create a pattern from regex
Pattern pattern = Pattern.compile(regex);
// Get the String to be matched
String stringToBeMatched
= "GFGFGFGFGFGFGFGFGFG FGF GFG GFG FGF";
// Create a matcher for the input String
Matcher matcher
= pattern.matcher(stringToBeMatched);
// Get the String to be replaced
String stringToBeReplaced = "GFG";
StringBuilder builder
= new StringBuilder();
// Replace every matched pattern
// with the target String
// using replaceAll() method
System.out.println("After Replacement: "
+ matcher
.replaceAll(stringToBeReplaced));
}
}
输出:
After Replacement: GGFGGGFGGGFGGGFGGFG GFG GFG GFG GFG
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