Search a String to find the first index of any character in the given set of characters. : String Find Search « Data Type « Java Tutorial

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Java Tutorial » Data Type » String Find Search 
2.29.20.Search a String to find the first index of any character in the given set of characters.Previous/Next
/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */




/**
 * Operations on {@link java.lang.String} that are
 * <code>null</code> safe.

 *
 @see java.lang.String
 @author <a href="http://jakarta.apache.org/turbine/">Apache Jakarta Turbine</a>
 @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
 @author Daniel L. Rall
 @author <a href="mailto:gcoladonato@yahoo.com">Greg Coladonato</a>
 @author <a href="mailto:ed@apache.org">Ed Korthof</a>
 @author <a href="mailto:rand_mcneely@yahoo.com">Rand McNeely</a>
 @author Stephen Colebourne
 @author <a href="mailto:fredrik@westermarck.com">Fredrik Westermarck</a>
 @author Holger Krauth
 @author <a href="mailto:alex@purpletech.com">Alexander Day Chaffee</a>
 @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
 @author Arun Mammen Thomas
 @author Gary Gregory
 @author Phil Steitz
 @author Al Chou
 @author Michael Davey
 @author Reuben Sivan
 @author Chris Hyzer
 @author Scott Johnson
 @since 1.0
 @version $Id: StringUtils.java 635447 2008-03-10 06:27:09Z bayard $
 */
public class Main {
  // IndexOfAny chars
  //-----------------------------------------------------------------------
  /**
   * Search a String to find the first index of any
   * character in the given set of characters.
   *
   * A <code>null</code> String will return <code>-1</code>.
   * A <code>null</code> or zero length search array will return <code>-1</code>.
   *
   * <pre>
   * StringUtils.indexOfAny(null, *)                = -1
   * StringUtils.indexOfAny("", *)                  = -1
   * StringUtils.indexOfAny(*, null)                = -1
   * StringUtils.indexOfAny(*, [])                  = -1
   * StringUtils.indexOfAny("zzabyycdxx",['z','a']) = 0
   * StringUtils.indexOfAny("zzabyycdxx",['b','y']) = 3
   * StringUtils.indexOfAny("aba", ['z'])           = -1
   * </pre>
   *
   @param str  the String to check, may be null
   @param searchChars  the chars to search for, may be null
   @return the index of any of the chars, -1 if no match or null input
   @since 2.0
   */
  public static int indexOfAny(String str, char[] searchChars) {
      if (isEmpty(str|| isEmpty(searchChars)) {
          return -1;
      }
      for (int i = 0; i < str.length(); i++) {
          char ch = str.charAt(i);
          for (int j = 0; j < searchChars.length; j++) {
              if (searchChars[j== ch) {
                  return i;
              }
          }
      }
      return -1;
  }
  // ----------------------------------------------------------------------
  /**
   * Checks if an array of Objects is empty or <code>null</code>.
   *
   @param array  the array to test
   @return <code>true</code> if the array is empty or <code>null</code>
   @since 2.1
   */
  public static boolean isEmpty(char[] array) {
      if (array == null || array.length == 0) {
          return true;
      }
      return false;
  }
  // Empty checks
  //-----------------------------------------------------------------------
  /**
   * Checks if a String is empty ("") or null.
   *
   * <pre>
   * StringUtils.isEmpty(null)      = true
   * StringUtils.isEmpty("")        = true
   * StringUtils.isEmpty(" ")       = false
   * StringUtils.isEmpty("bob")     = false
   * StringUtils.isEmpty("  bob  ") = false
   * </pre>
   *
   * NOTE: This method changed in Lang version 2.0.
   * It no longer trims the String.
   * That functionality is available in isBlank().
   *
   @param str  the String to check, may be null
   @return <code>true</code> if the String is empty or null
   */
  public static boolean isEmpty(String str) {
      return str == null || str.length() == 0;
  }

}
2.29.String Find Search
2.29.1.Find the latest index of any of a set of potential substrings.
2.29.2.Find the first index of any of a set of potential substrings.
2.29.3.Finds the first index within a String, handling null.
2.29.4.Finds the last index within a String from a start position, handling null.
2.29.5.Finds the n-th index within a String, handling null.
2.29.6.Use String.indexOf to locate a character in a string
2.29.7.Use String.lastIndexOf to find a character in a string
2.29.8.Use String.indexOf to locate a substring in a string
2.29.9.Use lastIndexOf to find a substring in a string
2.29.10.Demonstrate indexOf() and lastIndexOf().
2.29.11.Extract Substring with indexOf
2.29.12.Java String endsWith
2.29.13.Java String startsWith
2.29.14.Starts with, ignore case( regular expressions )
2.29.15.Ends with, ignore case( regular expressions )
2.29.16.Anywhere, ignore case( regular expressions )
2.29.17.Last occurrence of a character
2.29.18.Not found returns -1
2.29.19.A bubble sort for Strings.
2.29.20.Search a String to find the first index of any character in the given set of characters.
2.29.21.Search a String to find the first index of any character not in the given set of characters.
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