Java字符串replaceAll()

本文概述

• Java字符串replaceAll()示例：替换字符
• Java字符串replaceAll()示例：替换单词
• Java字符串replaceAll()示例：删除空格

Java字符串replaceAll()方法返回一个字符串, 该字符串将替换与正则表达式和替换字符串匹配的所有字符序列。

内部实施

public String replaceAll(String regex, String replacement) {
        return Pattern.compile(regex).matcher(this).replaceAll(replacement);
}

签名

public String replaceAll(String regex, String replacement)

参量

正则表达式：正则表达式

替换：字符的替换顺序

退货

替换字符串

Java字符串replaceAll()示例：替换字符

让我们看一个替换所有出现的单个字符的示例。

public class ReplaceAllExample1{
public static void main(String args[]){
String s1="srcmini is a very good website";
String replaceString=s1.replaceAll("a", "e");//replaces all occurrences of "a" to "e"
System.out.println(replaceString);
}}

立即测试

jevetpoint is e very good website

Java字符串replaceAll()示例：替换单词

让我们看一个示例来替换所有出现的单个单词或一组单词。

public class ReplaceAllExample2{
public static void main(String args[]){
String s1="My name is Khan. My name is Bob. My name is Sonoo.";
String replaceString=s1.replaceAll("is", "was");//replaces all occurrences of "is" to "was"
System.out.println(replaceString);
}}

立即测试

My name was Khan. My name was Bob. My name was Sonoo.

Java字符串replaceAll()示例：删除空格

让我们看一个示例, 删除所有出现的空格。

public class ReplaceAllExample3{
public static void main(String args[]){
String s1="My name is Khan. My name is Bob. My name is Sonoo.";
String replaceString=s1.replaceAll("\\s", "");
System.out.println(replaceString);
}}

立即测试

MynameisKhan.MynameisBob.MynameisSonoo.

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