JavaScript jQuery - How to check if a string contain specific words

Question

a    how are you   if  strpos  a  are       false        echo  true       In PHP  we can use the code above to check if a string contain specific words  but how can I do the same function in JavaScript jQuery

User · Answer

x000D   x000D  var str1    STACKOVERFLOW   x000D  var str2    OVER   x000D  if str1 indexOf str2     -1   x000D      console log str2     found    x000D    x000D   x000D   x000D

User · Answer

This will    bword b  test  Thisword is not valid      return false  when this one    bword b  test  This word is valid      will return true

User · Answer

You might wanna use include method in JS   var sentence    This is my line   console log sentence includes  my       returns true if substring is present    PS  includes is case sensitive

User · Answer

In javascript the includes   method can be used to determines whether a string contains particular word  or characters at specified position   Its case sensitive   var str    Hello there      var check1   str includes  there      true var check2   str includes  There      false  the method is case sensitive var check3   str includes  her        true var check4   str includes  o  4       true  o is at position 4  start at 0  var check5   str includes  o  6       false o is not at position 6

User · Answer

indexOf includes should not be used for finding whole words  It does not know the difference between find a word or just a part of a word   quot has a word quot  indexOf  wor       6  quot has a word quot  includes  wor      true   Check if a single word  whole word  is in the string Find a real whole word  not just if the letters of that word are somewhere in the string   x000D   x000D  const wordInString    s  word    gt  new RegExp    b    word      b    i   test s       tests                       true                     true    did              true    id               flase    yo               flase    you              true    you not          true   forEach q   gt  console log    wordInString  dID You  or did you NOt  gEt WHy    q       console log    wordInString  did you  or did you not  get why     you      true   x000D   x000D   x000D   Check if all words are in the string  x000D   x000D  var stringHasAll    s  query    gt        convert the query to array of  words   amp  checks EVERY item is contained in the string   query split      every q   gt  new RegExp    b    q      b    i   test s          tests                       true                     true    aa               true    aa               true     aa              true    d b              false    aaa              false    a b              false    a a a a a        false   forEach q   gt  console log    stringHasAll  aA bB cC dD   q      x000D   x000D   x000D

User · Answer

you can use indexOf for this  var a    how are you   if  a indexOf  are    gt  -1      return true    else     return false      Edit  This is an old answer that keeps getting up votes every once in a while so I thought I should clarify that in the above code  the if clause is not required at all because the expression itself is a boolean  Here is a better version of it which you should use   var a    how are you   return a indexOf  are    gt  -1    Update in ECMAScript2016   var a    how are you   return a includes  are       true

User · Answer

If you are looking for exact words and don t want it to match things like  nightmare   which is probably what you need   you can use a regex     bare b gi   b   word boundary g   global i   case insensitive  if needed    If you just want to find the characters  are   then use indexOf   If you want to match arbitrary words  you have to programatically construct a RegExp  regular expression  object itself based on the word string and use test

User · Answer

You re looking for the indexOf function   if  str indexOf  are    gt   0    Do stuff

User · Answer

An easy way to do it to use Regex match   method  -   For Example   var str   Hi  Its stacks over flow and stackoverflow Rocks       It will check word from beginning to the end of the string  if str match      W stack    W                alert  Word Match     else            alert  Word not found        Check the fiddle  NOTE  For adding case sensitiveness update the regex with      W stack    W  i   Thanks

[javascript] JavaScript/jQuery - How to check if a string contain specific words

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