正则表达式学习笔记2.3

最新推荐文章于 2024-04-20 16:29:27 发布

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最新推荐文章于 2024-04-20 16:29:27 发布

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本文链接：https://blog.youkuaiyun.com/weixin_34210740/article/details/85073541

本文介绍正则表达式的简记法，如d、D、w、W、s和S，并通过Java代码示例展示了如何使用这些简记法来匹配数字、非数字、单词字符、非单词字符、空白字符和非空白字符。

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l 对于常用的字符组，正则表达式提供了相应的简记法，方便地表示它们<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

l \d = [0-9]

l \D = [^0-9]

l \w = [0-9a-zA-Z_]

l \w = [^0-9a-zA-Z_]

l \s 匹配空白字符（回车、换行、制表、空格）

l \S 匹配非空白字符

例子：

public class GeneralNumFive {

public static void main(String[] args) {

String digitChar = "\\d";

String noDigitChar = "\\D";

String wordChar = "\\w";

String noWordChar = "\\W";

String spaceChar = "\\s";

String noSapceChar = "\\S";

String[] strs = new String[] { "0", "3", "8", "9","b","d","c"," ","\t","\n","\t"};

for (String string : strs) {

if(regexMatch(string,digitChar)){

System.out.println(string +"能够匹配正则:" + digitChar);

}else{

System.out.println(string +"不能够匹配正则:" + digitChar);

}

for (String string : strs) {

if(regexMatch(string,noDigitChar)){

System.out.println(string +"能够匹配正则:" + noDigitChar);

}else{

System.out.println(string +"不能够匹配正则:" + noDigitChar);

}

for (String string : strs) {

if(regexMatch(string,wordChar)){

System.out.println(string +"能够匹配正则:" + wordChar);

}else{

System.out.println(string +"不能够匹配正则:" + wordChar);

}

for (String string : strs) {

if(regexMatch(string,noWordChar)){

System.out.println(string +"能够匹配正则:" + noWordChar);

}else{

System.out.println(string +"不能够匹配正则:" + noWordChar);

}

for (String string : strs) {

if(regexMatch(string,spaceChar)){

System.out.println(string +"能够匹配正则:" + spaceChar);

}else{

System.out.println(string +"不能够匹配正则:" + spaceChar);

}

for (String string : strs) {

if(regexMatch(string,noSapceChar)){

System.out.println(string +"能够匹配正则:" + noSapceChar);

}else{

System.out.println(string +"不能够匹配正则:" + noSapceChar);

}

private static boolean regexMatch(String s, String regex) {

return s.matches(regex);

}

运行结果：

0能够匹配正则:\d

3能够匹配正则:\d

8能够匹配正则:\d

9能够匹配正则:\d

b不能够匹配正则:\d

d不能够匹配正则:\d

c不能够匹配正则:\d

不能够匹配正则:\d

0不能够匹配正则:\D

3不能够匹配正则:\D

8不能够匹配正则:\D

9不能够匹配正则:\D

b能够匹配正则:\D

d能够匹配正则:\D

c能够匹配正则:\D

能够匹配正则:\D

0能够匹配正则:\w

3能够匹配正则:\w

8能够匹配正则:\w

9能够匹配正则:\w

b能够匹配正则:\w

d能够匹配正则:\w

c能够匹配正则:\w

不能够匹配正则:\w

0不能够匹配正则:\W

3不能够匹配正则:\W

8不能够匹配正则:\W

9不能够匹配正则:\W

b不能够匹配正则:\W

d不能够匹配正则:\W

c不能够匹配正则:\W

能够匹配正则:\W

0不能够匹配正则:\s

3不能够匹配正则:\s

8不能够匹配正则:\s

9不能够匹配正则:\s

b不能够匹配正则:\s

d不能够匹配正则:\s

c不能够匹配正则:\s

能够匹配正则:\s

0能够匹配正则:\S

3能够匹配正则:\S

8能够匹配正则:\S

9能够匹配正则:\S

b能够匹配正则:\S

d能够匹配正则:\S

c能够匹配正则:\S

不能够匹配正则:\S

注意：\\d 当字符串包含字符本身时，需要对其进行转义\

未完待续。。。

正则表达式 学习笔记2.3

正则表达式学习笔记2.3