1, character classes
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[Abc] a, b, or C (Simple Profile)
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[^ Abc] any character, in addition to a, b or C (negative)
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[A-zA-Z] a to z or A to Z, including two letters (range)
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Character [0-9] comprises 0 to 9
2, case
public class Demo2_Regex {
/**
* [abc] a、b 或 c（简单类）
[^abc] 任何字符，除了 a、b 或 c（否定）
[a-zA-Z] a 到 z 或 A 到 Z，两头的字母包括在内（范围）
[a-d[m-p]] a 到 d 或 m 到 p：[a-dm-p]（并集）
[a-z&&[def]] d、e 或 f（交集）
[a-z&&[^bc]] a 到 z，除了 b 和 c：[ad-z]（减去）
[a-z&&[^m-p]] a 到 z，而非 m 到 p：[a-lq-z]（减去）
*/
public static void main(String[] args) {
//demo1();
//demo2();
//demo3();
//demo4();
//demo5();
//demo6();
String regex = "[a-z&&[^m-p]]";
System.out.println("m".matches(regex));
System.out.println("a".matches(regex));
System.out.println("z".matches(regex));
System.out.println("n".matches(regex));
}
private static void demo6() {
String regex = "[a-z&&[^bc]]";
System.out.println("a".matches(regex));
System.out.println("b".matches(regex));
System.out.println("1".matches(regex));
}
private static void demo5() {
String regex = "[a-z&&[def]]"; //取交集
System.out.println("a".matches(regex));
System.out.println("d".matches(regex));
}
private static void demo4() {
String regex = "[a-d[m-p]]";
System.out.println("a".matches(regex));
System.out.println("m".matches(regex));
System.out.println("n".matches(regex));
}
private static void demo3() {
String regex = "[a-zA-Z]";
System.out.println("a".matches(regex));
System.out.println("A".matches(regex));
System.out.println("z".matches(regex));
System.out.println("Z".matches(regex));
System.out.println("1".matches(regex));
System.out.println("%".matches(regex));
}
private static void demo2() {
String regex = "[^abc]";
System.out.println("a".matches(regex));
System.out.println("b".matches(regex));
System.out.println("c".matches(regex));
System.out.println("d".matches(regex));
System.out.println("1".matches(regex));
System.out.println("%".matches(regex));
System.out.println("10".matches(regex)); //10代表1字符和0字符,不是单个字符
}
private static void demo1() {
String regex = "[abc]"; //[]代表单个字符
System.out.println("a".matches(regex));
System.out.println("b".matches(regex));
System.out.println("c".matches(regex));
System.out.println("d".matches(regex));
System.out.println("1".matches(regex));
System.out.println("%".matches(regex));
}
}