Java将字符串与正则表达式进行比较-While循环 [英] Java comparing string to regex - while loop

问题描述

我希望用户输入一个字符串，如果该字符串与我的正则表达式不匹配，那么我希望输出一条消息，然后用户再次输入一个值.

I want the user to enter a string and if the string does not match my regex expression then I want a message to be outputted and the user to enter a value again.

问题在于，即使字符串与正则表达式匹配，它也将其视为不匹配.

The problem is even when the string matches the regex it is treating it as if it does not match.

我的正则表达式: 这应该等于-Name, Name

My regex: This should equal - Name, Name

[[A-Z][a-zA-Z]*,\s[A-Z][a-zA-Z]*]

我的while循环:

  System.out.println("Enter the student's name in the following format - surname, forename: ");  studentName = input.next();
  while (!studentName.equals("[[A-Z][a-zA-Z]*,\\s[A-Z][a-zA-Z]*]")) {
    System.out.println("try again");
    studentName = input.next();
  }

推荐答案

equals方法检查字符串是否等效，而不是匹配正则表达式.

The equals methods checks for string equivalence, not for matching regular expressions.

只需将equals替换为matches.您还应该卸下外部方括号.

Just replace equals with matches. You should also remove the outer square brackets.

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