1、查找字符串中的字串
1 package com.wy.regular; 2 3 import java.util.regex.Matcher; 4 import java.util.regex.Pattern; 5 6 public class RegularTest { 7 8 public static void main(String[] args) { 9 /** 10 * 字符串的替换 replacement 11 */ 12 Pattern pattern = Pattern.compile("java"); 13 Matcher matcher = pattern.matcher("java Java JAVa JaVa I love JAVA you hate Java"); 14 // 查找所有的Java 15 while (matcher.find()) { 16 pri(matcher.group());// 只有一个java 17 } 18 } 19 20 public static void pri(Object object){ 21 System.out.println(object); 22 } 23 }
2、忽略大小写
1 package com.wy.regular; 2 3 import java.util.regex.Matcher; 4 import java.util.regex.Pattern; 5 6 public class RegularTest { 7 8 public static void main(String[] args) { 9 /** 10 * 字符串的替换 replacement 13 * 使用compile(String regex, int flags)方法 14 * CASE_INSENSITIVE 大小写不敏感,忽略大小写 15 */ 16 Pattern pattern = Pattern.compile("java", Pattern.CASE_INSENSITIVE); 17 Matcher matcher = pattern.matcher("java Java JAVa JaVa I love JAVA you hate Java"); 18 /** 19 * 查找所有的Java,结果是: 20 * java 21 * Java 22 * JAVa 23 * JaVa 24 * JAVA 25 * Java 26 */ 27 while (matcher.find()) { 28 pri(matcher.group()); 29 } 30 } 31 32 public static void pri(Object object){ 33 System.out.println(object); 34 } 35 }
3、替换成大写
1 package com.wy.regular; 2 3 import java.util.regex.Matcher; 4 import java.util.regex.Pattern; 5 6 public class RegularTest { 7 8 public static void main(String[] args) { 9 /** 10 * 字符串的替换 replacement 11 * 使用compile(String regex, int flags)方法 12 * CASE_INSENSITIVE 大小写不敏感,忽略大小写 13 */ 14 Pattern pattern = Pattern.compile("java", Pattern.CASE_INSENSITIVE); 15 Matcher matcher = pattern.matcher("java Java JAVa JaVa I love JAVA you hate Java"); 16 // 替换所有的Java为大写 17 pri(matcher.replaceAll("JAVA"));// 打印结果:JAVA JAVA JAVA JAVA I love JAVA you hate JAVA 18 } 19 20 public static void pri(Object object){ 21 System.out.println(object); 22 } 23 }
4、单数个替换为大写,双数个替换为小写
1 package com.wy.regular; 2 3 import java.util.regex.Matcher; 4 import java.util.regex.Pattern; 5 6 public class RegularTest { 7 8 public static void main(String[] args) { 9 /** 10 * 字符串的替换 replacement 11 * 使用compile(String regex, int flags)方法 12 * CASE_INSENSITIVE 大小写不敏感,忽略大小写 13 */ 14 Pattern pattern = Pattern.compile("java", Pattern.CASE_INSENSITIVE); 15 Matcher matcher = pattern.matcher("java Java JAVa JaVa I love JAVA you hate Java tail"); 16 // 单数个替换为大写,双数个替换为小写 17 StringBuffer buffer = new StringBuffer(); 18 int i = 0; 19 while (matcher.find()) { 20 i++; 21 if (i%2==0) { 22 matcher.appendReplacement(buffer, "java"); 23 } else{ 24 matcher.appendReplacement(buffer, "JAVA"); 25 } 26 } 27 pri(buffer);// 结果:JAVA java JAVA java I love JAVA you hate java,没有结尾的tail 28 matcher.appendTail(buffer);// 添加最后的字符串 29 pri(buffer);// 结果:JAVA java JAVA java I love JAVA you hate java tail 30 } 31 32 public static void pri(Object object){ 33 System.out.println(object); 34 } 35 }