Regular expression

[Duran Harris]

Hi exam-takers,

Was wondering if you guys would mind providing me with the regular expression to find :

Either '*','-','+','/'

I tried this:

Pattern p=Pattern.compile("[\\+\\*/-]");

But I dont get any matches...any tips??

[Duran Harris]

Don't worry its working..

[Deepak Bala]

This would work too

  
	private void regex() {
		String regex = "[*+-/]+";
		String input = "*wint-+ER/";
		Pattern pattern = Pattern.compile(regex);
		Matcher matcher = pattern.matcher(input);
		while(matcher.find())
		{
			System.out.println(matcher.group());
		}
	}
  

The code does not necessarily need the \\ escape. Use \\ only to escape \ to represent other wildcards like \d

[Henry Wong]

        String regex = "[*+-/]+";

Be careful here. The "-" sign has special meaning inside a character class. It should be the last character, if you want to disable the special meaning.

Henry

[Deepak Bala]

Henry Wong wrote:

        String regex = "[*+-/]+";

Be careful here. The "-" sign has special meaning inside a character class. It should be the last character, if you want to disable the special meaning.

Henry

Ah ! Thanks for pointing out. As an exercise you could try "[*-+/]+" and "[*+/-]+" to see what that means