Extract digits from string - StringUtils Java

Question

I have a String and I want to extract the (only) sequence of digits in the string.

Example: helloThisIsA1234Sample. I want the 1234

It\'s a given that the s

Answer 1

        String line = "This order was32354 placed for QT ! OK?";
        String regex = "[^\\d]+";

        String[] str = line.split(regex);

        System.out.println(str[1]);

Answer 2

You can use the following Code to retain Integers from String.

String text="Hello1010";
System.out.println(CharMatcher.digit().retainFrom(text));

Will give you the Following Output

1010

Answer 3

Use a regex such as [^0-9] to remove all non-digits.

From there, just use Integer.parseInt(String);

Answer 4

You can try this:

  String str="java123java456";
  String out="";
  for(int i=0;i<str.length();i++)
  {
    int a=str.codePointAt(i);
     if(a>=49&&a<=57)
       {
          out=out+str.charAt(i);
       }
   }
 System.out.println(out);

Answer 5

You can use str = str.replaceAll("\\D+","");

Answer 6

I always like using Guava String utils or similar for these kind of problems:

String theDigits = CharMatcher.inRange('0', '9').retainFrom("abc12 3def"); // 123