模式匹配以检测单词中的特殊字符

Question

I am trying to identify any special characters ('?', '.', ',') at the end of a string in java. Here is what I wrote:

public static void main(String[] args) {
    Pattern pattern = Pattern.compile("{.,?}$");
    Matcher matcher = pattern.matcher("Sure?");
    System.out.println("Input String matches regex - "+matcher.matches());

}

This returns a false when it's expected to be true . Please suggest.

Answer 1

Use "sure?".matches(".*[.,?]") .

String#matches(...) anto-anchors the regex with ^ and $ , no need to add them manually.

Answer 2

Try this

Pattern pattern = Pattern.compile(".*[.,?]");
...

Answer 3

This is your code:

Pattern pattern = Pattern.compile("{.,?}$");
Matcher matcher = pattern.matcher("Sure?");
System.out.println("Input String matches regex - "+matcher.matches());

You have 2 problems:

1. You're using { and } instead of character class [ and ]
2. You're using Matcher#matches() instead of Matcher#find . matches method matches the full input line while find performs a search anywhere in the string.

Change your code to:

Pattern pattern = Pattern.compile("[.,?]$");
Matcher matcher = pattern.matcher("Sure?");
System.out.println("Input String matches regex - " + matcher.find());