Test if a string contains any of the strings from an array

Question

How do I test a string to see if it contains any of the strings from an array   Instead of using  if  string contains item1     string contains item2     string contains item3

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If you are seraching for whole words you can do this that works case insensitive   private boolean containsKeyword String line  String   keywords        String   inputWords   line split            for  String inputWord   inputWords                for  String keyword   keywords                        if  inputWord equalsIgnoreCase keyword                                 return true                                     return false

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We can also do like this  if  string matches  quot        i item1 item2 item3     quot       i   used for case insensitive      amp       used for checking whether it is present anywhere in between the string

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If you use Java 8 or above  you can rely on the Stream API to do such thing   public static boolean containsItemFromArray String inputString  String   items           Convert the array of String items as a Stream        For each element of the Stream call inputString contains element         If you have any match returns true  false otherwise     return Arrays stream items  anyMatch inputString  contains       Assuming that you have a big array of big String to test you could also launch the search in parallel by calling parallel    the code would then be   return Arrays stream items  parallel   anyMatch inputString  contains

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Since version 3 4 Apache Common Lang 3 implement the containsAny method

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A more groovyesque approach would be to use inject in combination with metaClass   I would to love to say   String myInput  This string is FORBIDDEN  myInput containsAny   FORBIDDEN   NOT ALLOWED        gt true   And the method would be   myInput metaClass containsAny  List lt String gt  notAllowedTerms- gt     notAllowedTerms  inject false  found term- gt found    delegate contains term        If you need containsAny to be present for any future String variable then add the method to the class instead of the object   String metaClass containsAny  notAllowedTerms- gt     notAllowedTerms  inject false  found term- gt found    delegate contains term

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if  Arrays asList array  contains string

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Here is one solution    public static boolean containsAny String str  String   words       boolean bResult false     will be set  if any of the words are found      String   words     word1    word2    word3    word4    word5        List lt String gt  list   Arrays asList words      for  String word  list            boolean bFound   str contains word          if  bFound   bResult bFound  break           return bResult

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And if you are looking for case insensitive match  use pattern Pattern pattern   Pattern compile  quot   bitem1  item2  b quot  java util regex Pattern CASE INSENSITIVE    Matcher matcher   pattern matcher input   if  matcher find

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Try this   if  Arrays asList item1  item2  item3  stream   anyMatch string  contains

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import org apache commons lang StringUtils    String Utils  Use    StringUtils indexOfAny inputString  new String   item1  item2  item3     It will return the index of the string found or -1 if none is found

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The below should work for you assuming Strings is the array that you are searching within   Arrays binarySearch Strings  mykeytosearch  mysearchComparator     where mykeytosearch is the string that you want to test for existence within the array  mysearchComparator - is a comparator that would be used to compare strings   Refer to Arrays binarySearch for more information

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EDIT  Here is an update using the Java 8 Streaming API  So much cleaner  Can still be combined with regular expressions too  public static boolean stringContainsItemFromList String inputStr  String   items        return Arrays stream items  anyMatch inputStr  contains      Also  if we change the input type to a List instead of an array we can use items stream   anyMatch inputStr  contains   You can also use  filter inputStr  contains  findAny   if you wish to return the matching string  Important  the above code can be done using parallelStream   but most of the time this will actually hinder performance  See this question for more details on parallel streaming   Original slightly dated answer  Here is a  VERY BASIC  static method  Note that it is case sensitive on the comparison strings  A primitive way to make it case insensitive would be to call toLowerCase   or toUpperCase   on both the input and test strings  If you need to do anything more complicated than this  I would recommend looking at the Pattern and Matcher classes and learning how to do some regular expressions  Once you understand those  you can use those classes or the String matches   helper method  public static boolean stringContainsItemFromList String inputStr  String   items        for int i  0  i  lt  items length  i                  if inputStr contains items i                          return true                      return false

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The easiest way would probably be to convert the array into a java util ArrayList   Once it is in an arraylist  you can easily leverage the contains method   public static boolean bagOfWords String str        String   words     word1    word2    word3    word4    word5          return  Arrays asList words  contains str

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You can use String matches method like this   System out printf  Matches -   s  n   string matches       item1 item2 item3

[java] Test if a string contains any of the strings from an array

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