Comparison of Regular Expressions

RegexTest.java

import java.util.regex.Matcher;
import java.util.regex.Pattern;

Pattern STATE_REGEX = Pattern.compile( "\\b(?<stateCode>[a-zA-Z]{2})$" );
Matcher matcher = STATE_REGEX.matcher( input );

List<ZipCode> zipCodeList = new ArrayList<>();

if ( matcher.find() ) {
    String city = input.substring( 0, matcher.start() - 1 );
    city = city.replaceAll( "[^\\w\\s]", " " )
               .trim();
    String state = matcher.group( "stateCode" );
    zipCodeList = getZipCode( city, state );
}

regextest.py

import re

STATE_REGEX = re.compile(r'\b(?P<state_code>[a-zA-Z]{2})$')
match = STATE_REGEX.search(input)

zip_code_list = []

if match is not None:
    city = input[:match.start()].replace(r'[^\w\s]', ' ').strip()
    state = match.group('state_code')
    zip_code_list = get_zip_code(city, state)