content: /*
  
   * Copyright (C) 2011 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.ex.chips;
  
  import android.text.TextUtils;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * A utility class for chips using phone numbers.
   */
  public class PhoneUtil {
  
      // This pattern comes from android.util.Patterns. It has been tweaked to handle a "1" before
      // parens, so numbers such as "1 (425) 222-2342" match.
      private static final Pattern PHONE_PATTERN
              = Pattern.compile(                                  // sdd = space, dot, or dash
                      "(\\+[0-9]+[\\- \\.]*)?"                    // +<digits><sdd>*
                      + "(1?[ ]*\\([0-9]+\\)[\\- \\.]*)?"         // 1(<digits>)<sdd>*
                      + "([0-9][0-9\\- \\.][0-9\\- \\.]+[0-9])"); // <digit><digit|sdd>+<digit>
  
      /**
       * Returns true if the string is a phone number.
       */
      public static boolean isPhoneNumber(String number) {
          // TODO: replace this function with libphonenumber's isPossibleNumber (see
          // PhoneNumberUtil). One complication is that it requires the sender's region which
          // comes from the CurrentCountryIso. For now, let's just do this simple match.
          if (TextUtils.isEmpty(number)) {
              return false;
          }
  
          Matcher match = PHONE_PATTERN.matcher(number);
          return match.matches();
      }
  }
  