Phone number regex Java
The regular expressions below can be used to validate if a string is a valid phone number format and to extract a phone number from a string. Please note that this validation can not tell if a phone number actually exists.
The basic international phone number validation
A simple regex to validate string against a valid international phone number format without delimiters and with an optional plus sign:
Pattern.compile("^\\+?[1-9][0-9]{7,14}$")
Enter a text in the input above to see the result
Example code in Java
import java.util.regex.Pattern;
import java.util.regex.MatchResult;
public class Main {
public static void main(String []args) {
// Validate phone number
boolean isMatch = Pattern.compile("^\\+?[1-9][0-9]{7,14}$")
.matcher("+12223334444")
.find(); // returns true
// Extract a phone number from a string
String[] matches = Pattern.compile("\\+?[1-9][0-9]{7,14}")
.matcher("You can reach me out at +12223334444 and +56667778888")
.results()
.map(MatchResult::group)
.toArray(String[]::new); // returns ["+12223334444", "+56667778888"]
}
}
The more complex phone number validation
This regular expression will match phone numbers entered with delimiters (spaces, dots, brackets, etc.)
Pattern.compile("^\\+?\\d{1,4}?[-.\\s]?\\(?\\d{1,3}?\\)?[-.\\s]?\\d{1,4}[-.\\s]?\\d{1,4}[-.\\s]?\\d{1,9}$")Enter a text in the input above to see the result
Example code in Java
import java.util.regex.Pattern;
import java.util.regex.MatchResult;
public class Main {
public static void main(String []args) {
// Validate phone number
boolean isMatch = Pattern.compile("^\\+?\\d{1,4}?[-.\\s]?\\(?\\d{1,3}?\\)?[-.\\s]?\\d{1,4}[-.\\s]?\\d{1,4}[-.\\s]?\\d{1,9}$")
.matcher("+1 (615) 243-5172")
.find(); // returns true
}
}
Extra information about validating phone number
While validation of phone numbers using regex can give a possibility to check the format of the phone number, it does not guarantee that the number exists.
There might be also an option to leave a phone number field without any validation since some users might have:
- More complex phone numbers with extensions
- The different phone numbers for calling them on a different time of day
