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Match address using regular expressions

This is an example of how to match an address using regular expressions. We have created a method boolean isValidAddr(String addr) and used it to match some addresses to a specified pattern. The method is described below:

  • The method reads a String address and returns true if a specified pattern matches the address and false otherwise.
  • It has a a String nameToken, that is a regular expression consisting of an uppercase character followed by a capturing group of a lowercase character and a non-whitespace character once or not at all.
  • The namePattern is also a String regular expression consisting of the nameToken at least 2 but no more that 3 times.
  • The zipCodePattern is also a String regular expression consisting of a digit appearing exactly 5 times and a capturing group that consists of the – followed by a digit exactly 4 times.
  • The addressPattern that is the full regular expression to match the input address consists of the ^ to match the beginning of a line, then the namePattern, then a word character one or more times, any character as many times, again a word character one or more times, the zipCodePattern and then the $ to match a line ending.
  • The input String is matched to the constructed regular expression, using matches(String regex) API method of String and the result is returned.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;

public class MatchAddress {

    public static void main(String args[]) {


  isValidAddr("John Smith 888 Luck Street,NY 64332");

  isValidAddr("John A. Smith 888 Luck Street, NY 64332-4453");

  isValidAddr("John Allen Smith 888 Luck Street, NY 64332-4453");

  isValidAddr("888 Luck Street, NY 64332");

  isValidAddr("P.O. BOX 888 Luck Street, NY 64332-4453");

  isValidAddr("John Allen Smith 888 Luck st., NY");
    }

    public static boolean isValidAddr(String addr) {

  boolean retval = false;


  String nameToken = "\p{Upper}(\p{Lower}+\s?)";


  String namePattern = "(" + nameToken + "){2,3}";


  String zipCodePattern = "\d{5}(-\d{4})?";


  String addressPattern = "^" + namePattern + "\w+ .*, \w+ "


    + zipCodePattern + "$";


  retval = addr.matches(addressPattern);


  String msg = "NO MATCHnpattern:n " + addr + "nregexLength:n "


    + addressPattern;


  if (retval) {


msg = "MATCHnpattern:n " + addr + "nregexLength:n "



  + addressPattern;

  }

  System.out.println(msg + "rn");

  return retval;
    }
}

Output:

NO MATCH
pattern:
 John Smith 888 Luck Street,NY 64332
regexLength:
 ^(p{Upper}(p{Lower}+s?)){2,3}w+ .*, w+ d{5}(-d{4})?$

NO MATCH
pattern:
 John A. Smith 888 Luck Street, NY 64332-4453
regexLength:
 ^(p{Upper}(p{Lower}+s?)){2,3}w+ .*, w+ d{5}(-d{4})?$

MATCH
pattern:
 John Allen Smith 888 Luck Street, NY 64332-4453
regexLength:
 ^(p{Upper}(p{Lower}+s?)){2,3}w+ .*, w+ d{5}(-d{4})?$

NO MATCH
pattern:
 888 Luck Street, NY 64332
regexLength:
 ^(p{Upper}(p{Lower}+s?)){2,3}w+ .*, w+ d{5}(-d{4})?$

NO MATCH
pattern:
 P.O. BOX 888 Luck Street, NY 64332-4453
regexLength:
 ^(p{Upper}(p{Lower}+s?)){2,3}w+ .*, w+ d{5}(-d{4})?$

NO MATCH
pattern:
 John Allen Smith 888 Luck st., NY
regexLength:
 ^(p{Upper}(p{Lower}+s?)){2,3}w+ .*, w+ d{5}(-d{4})?$

 
This was an example of how to match an address using regular expressions in Java.

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