To check if string contains particular word

Question

So how do you check if a string has a particular word in it    So this is my code    a setOnClickListener new View OnClickListener               Override         public void onClick View arg0                   TODO Auto-generated method stub             if d contains  Hey                     c setText  OUTPUT  SUCCESS                   else                  c setText  OUTPUT  FAIL                                         I m getting an error

User · Answer

You can use regular expressions   if  d matches    Hey            c setText  OUTPUT  SUCCESS       else       c setText  OUTPUT  FAIL              -  0 or more of any characters  Hey -  The string you want  If you will be checking this often  it is better to compile the regular expression in a Pattern object and reuse the Pattern instance to do the checking   private static final Pattern HEYPATTERN   Pattern compile    Hey            if  HEYPATTERN matcher d  matches          c setText  OUTPUT  SUCCESS       else       c setText  OUTPUT  FAIL           Just note this will also match  Heyburg  for example since you didn t specify you re searching for  Hey  as an independent word  If you only want to match Hey as a word  you need to change the regex to     bHey  b

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It s been correctly pointed out above that finding a given word in a sentence is not the same as finding the charsequence  and can be done as follows if you don t want to mess around with regular expressions   boolean checkWordExistence String word  String sentence        if  sentence contains word             int start   sentence indexOf word           int end   start   word length             boolean valid left     start    0      sentence charAt start - 1                    boolean valid right     end    sentence length        sentence charAt end                     return valid left  amp  amp  valid right            return false      Output   checkWordExistence  the    the earth is our planet    true checkWordExistence  ear    the earth is our planet    false checkWordExistence  earth    the earth is our planet    true   P S Make sure you have filtered out any commas or full stops beforehand

User · Answer

Maybe this post is old  but I came across it and used the  wrong  usage  The best way to find a keyword is using  contains  example   if   d contains  hello                  System out println  I found the keyword

User · Answer

Using contains String sentence    quot Check this answer and you can find the keyword with this code quot   String search    quot keyword quot    if  sentence toLowerCase   contains search toLowerCase          System out println  quot I found the keyword    quot       else      System out println  quot not found    quot

User · Answer

String sentence    Check this answer and you can find the keyword with this code       String search    keyword     Compare the line of string  in given string  if   sentence toLowerCase   trim    equals search toLowerCase   trim       System out println  not found      else         System out println  I found the keyword

User · Answer

The other answer  to date  appear to check for substrings rather than words  Major difference  With the help of this article  I have created this simple method  static boolean containsWord String mainString  String word         Pattern pattern   Pattern compile  quot   b quot    word    quot   b quot   Pattern CASE INSENSITIVE       quot   b quot  represents any word boundary      Matcher matcher   pattern matcher mainString       return matcher find

User · Answer

if  someString indexOf  Hey   gt  0        doSomething

User · Answer

Solution-1  - If you want to search for a combination of characters or an independent word from a sentence   String sentence    In the Name of Allah  the Most Beneficent  the Most Merciful   if  sentence matches    Beneficent       return true   else return false     Solution-2  - There is another possibility you want to search for an independent word from a sentence then Solution-1 will also return true if you searched a word exists in any other word  For example  If you will search cent from a sentence containing this word    Beneficent   then Solution-1 will return true  For this remember to add space in your regular expression   String sentence    In the Name of Allah  the Most Beneficent  the Most Merciful   if  sentence matches     cent        return true   else return false     Now in Solution-2 it wll return false because no independent cent word exist   Additional  You can add or remove space on either side in 2nd solution according to your requirements

User · Answer

contains   is perfectly valid and a good way to check    http   docs oracle com javase 1 5 0 docs api java lang String html contains java lang CharSequence    Since you didn t post the error  I guess d is either null or you are getting the  Cannot refer to a non-final variable inside an inner class defined in a different method  error   To make sure it s not null  first check for null in the if statement  If it s the other error  make sure d is declared as final or is a member variable of your class  Ditto for c

User · Answer

Not as complicated as they say  check this you will not regret   String sentence    Check this answer and you can find the keyword with this code   String search     keyword    if   sentence toLowerCase   indexOf search toLowerCase       -1         System out println  I found the keyword       else       System out println  not found         You can change the toLowerCase   if you want

[java] To check if string contains particular word

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