Wael Wael - 8 days ago 5
Java Question

how to extract a phone number for a string using regular expression?

If I have a string that contains the following: This is 1 test 123-456-7890

I need to extract 1234567890 as a phone number. I don't want to extract the number 1 that is before test.

How can I do that using regular expressions in java?

I know a way but I am not sure if it is the best solution:

String inputString = "This is 1 test 123-456-7890";
string result = inputString.replaceAll("(\\d{3})-(\\d{3})-(\\d{4})","");
String phoneNumber = inputString.replace(result, "");

Answer

The following code will check for the phone number in the string you mention and print it:

String str = "This is 1 test 123-456-7890";

Pattern pattern = Pattern.compile("\\d{3}-\\d{3}-\\d{4}");
Matcher matcher = pattern.matcher(str);
if (matcher.find()) {
    System.out.println(matcher.group(0));
}

But, as pointed out in other answers, many phone numbers (especially not international ones) will not match the pattern.

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