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法律研究Pattern COMMENTS 域在 Java 中带示例
Pattern 类的 COMMENTS 域允许在模式中使用空格和注释。当你将此用作 compile() 方法的标志值时，给定模式中的空格和以 # 开头的注释将被忽略。
示例 1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class COMMENTES_Example {
public static void main( String args[] ) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter input data: ");
String input = sc.nextLine();
//Regular expression to find digits
String regex = "\d #ignore this comment\n";
//Compiling the regular expression
Pattern pattern = Pattern.compile(regex, Pattern.COMMENTS);
//Retrieving the matcher object
Matcher matcher = pattern.matcher(input);
int count = 0;
String result = "";
while (matcher.find()) {
count++;
result = result+matcher.group();
}
System.out.println("Number of digits in the given text: "+count);
}
}输出
Enter input data: sample1 text2 with3 numbers4 in5 between6 Number of digits in the given text: 6
示例 2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class COMMENTES_Example {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter your name: ");
String name = sc.nextLine();
System.out.println("Enter your Date of birth: ");
String dob = sc.nextLine();
//Regular expression to accept date in MM-DD-YYY format
String regex = "^(1[0-2]|0[1-9])/
# For Month\n" + "(3[01]|[12][0-9]|0[1-9])/
# For Date\n" + "[0-9]{4}$ # For Year";
//Creating a Pattern object
Pattern pattern = Pattern.compile(regex, Pattern.COMMENTS);
//Creating a Matcher object
Matcher matcher = pattern.matcher(dob);
boolean result = matcher.matches();
if(result) {
System.out.println("Given date of birth is valid");
} else {
System.out.println("Given date of birth is not valid");
}
}
}输出
Enter your name: Krishna Enter your Date of birth: 09/26/1989 Given date of birth is valid
更新于： 2019-11-20
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