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
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
不能够匹配正则:\d
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
能够匹配正则:\D
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
不能够匹配正则:\w
不能够匹配正则:\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
能够匹配正则:\W
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
能够匹配正则:\s
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
不能够匹配正则:\S
不能够匹配正则:\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。。。
