regular expression

stay java In a /： Represents the translation character , So we need two // It means a /.

Code ：

public class  Matching basis  {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
       String str = "abc";
       System.out.println(str.matches("abc"));
	}

}

Code ：

public class  Matching basis  {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
       String str = "a&c";
       System.out.println(str.matches("a\\&c"));
	}

}

 

  Code ：

public class  Matching basis  {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
       String str = "a and c";
       System.out.println(str.matches("a\\u548cc"));
	}

}

Code ：

public class  Matching basis  {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
       String str = "a and c";// and : Right and wrong ASCALL character 
       System.out.println(str.matches("a.c"));
       String str1 = "a.c";//.: It's a special character 
       System.out.println(str1.matches("a.c"));// there . Represents matching any character 
       System.out.println(str1.matches("a\\.c"));// Here is the match   .   This special character ： Special character matching requires translation 
	}

}

 

 

 

 

 

 

 \d*: Indicates that any number can be matched

Be careful ：System.out.println(str1.matches("*")); This is incorrect

System.out.println(str1.matches("+")); This is incorrect

however

System.out.println(str1.matches(".")); It's the right way to use it ： The table matches any character

 

 \d+: Indicates that at least one number is matched

 \d?： Represents a match 0 Or 1 A digital

 

 

 

 

 

  matching a-f perhaps 0-9 In between 6 Characters

 

  Can match a To f perhaps 0 To 9 perhaps _ Medium 6 Characters