How to check if a string contains text from an array of substrings in JavaScript

Question

Pretty straight forward  In javascript  I need to check if a string contains any substrings held in an array

User · Answer

Javascript function to search an array of tags or keywords using a search string or an array of search strings. (Uses ES5 some array method and ES6 arrow functions)

// returns true for 1 or more matches, where 'a' is an array and 'b' is a search string or an array of multiple search strings
function contains(a, b) {
    // array matches
    if (Array.isArray(b)) {
        return b.some(x => a.indexOf(x) > -1);
    }
    // string match
    return a.indexOf(b) > -1;
}

Example usage:

var a = ["a","b","c","d","e"];
var b = ["a","b"];
if ( contains(a, b) ) {
    // 1 or more matches found
}

User · Answer

Best answer is here  This is case insensitive as well      var specsFilter                var yourString                    if found a match     if  specsFilter some  element    gt    return new RegExp element   ig   test yourString                   do something

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One line solution  substringsArray some substring  gt yourBigString includes substring     Returns true false if substring exists does nt exist  Needs ES6 support

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convert to array   function  sentence         return sentence trim   split  quot   quot        let ages   convert to array   quot I m a programmer in javascript writing script quot     function confirmEnding string    let target    quot ipt quot       return   string substr -target length      target    true   false     function mySearchResult     return ages filter confirmEnding      mySearchResult     you could check like this and return an array of the matched words using filter

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Using underscore js or lodash js  you can do the following on an array of strings   var contacts     Billy Bob    John    Bill    Sarah     var filters     Bill    Sarah     contacts     filter contacts  function contact        return   every filters  function filter    return  contact indexOf filter      -1                 John     And on a single string   var contact    Billy   var filters     Bill    Sarah       every filters  function filter    return  contact indexOf filter   gt   0           true

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var str    texttexttext   var arr     asd    ghj    xtte    for  var i   0  len   arr length  i  lt  len    i        if  str indexOf arr i      -1               str contains arr i            edit   If the order of the tests doesn t matter  you could use this  with only one loop variable    var str    texttexttext   var arr     asd    ghj    xtte    for  var i   arr length - 1  i  gt   0  --i        if  str indexOf arr i      -1               str contains arr i

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If you re working with a long list of substrings consisting of full  words  separated by spaces or any other common character  you can be a little clever in your search   First divide your string into groups of X  then X 1  then X 2       up to Y  X and Y should be the number of words in your substring with the fewest and most words respectively  For example if X is 1 and Y is 4   Alpha Beta Gamma Delta  becomes    Alpha   Beta   Gamma   Delta    Alpha Beta   Beta Gamma   Gamma Delta    Alpha Beta Gamma   Beta Gamma Delta    Alpha Beta Gamma Delta   If X would be 2 and Y be 3  then you d omit the first and last row   Now you can search on this list quickly if you insert it into a Set  or a Map   much faster than by string comparison   The downside is that you can t search for substrings like  ta Gamm   Of course you could allow for that by splitting by character instead of by word  but then you d often need to build a massive Set and the time memory spent doing so outweighs the benefits

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Not that I m suggesting that you go and extend modify String s prototype  but this is what I ve done   String prototype includes     x000D   x000D  String prototype includes   function  includes    x000D      console warn  String prototype includes   has been modified     x000D      return function  searchString  position    x000D          if  searchString instanceof Array    x000D              for  var i   0  i  lt  searchString length  i      x000D                  if  includes call this  searchString i   position     x000D                      return true  x000D                    x000D                x000D              return false  x000D            else   x000D              return includes call this  searchString  position   x000D            x000D        x000D    String prototype includes   x000D   x000D  console log   Hello  World   includes  foo                Hello  World   includes  foo                   false x000D  console log   Hello  World   includes                     Hello  World   includes                        true x000D  console log   Hello  World   includes   foo               Hello  World   includes   foo                  true x000D  console log   Hello  World   includes   foo         6     Hello  World   includes   foo         6        false x000D   x000D   x000D

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For people Googling   The solid answer should be   const substrings     connect    ready    const str    disconnect   if  substrings some v   gt  str     v           Will only return when the  str  is included in the  substrings

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let obj     name    amit    name    arti    name    sumit     let input    it     Use filter    obj filter  n   gt  n name trim   toLowerCase   includes input trim   toLowerCase

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If the array is not large  you could just loop and check the string against each substring individually using indexOf    Alternatively you could construct a regular expression with substrings as alternatives  which may or may not be more efficient

User · Answer

Here s what is  IMO  by far the best solution  It s a modern  ES6  solution that   is efficient  one line   avoids for loops unlike the some   function that s used in the other answers  this one doesn t just return a boolean  true false  instead  it either returns the substring  if it was found in the array   or returns undefined goes a step further and allows you to choose whether or not you need partial substring matches  examples below   Enjoy    const arrayOfStrings     abc    def    xyz    const str    abc   const found   arrayOfStrings find v   gt   str     v     Here  found would be set to  abc  in this case  This will work for exact string matches  If instead you use  const found   arrayOfStrings find v   gt  str includes v     Once again  found would be set to  abc  in this case  This doesn t allow for partial matches  so if str was set to  ab   found would be undefined   And  if you want partial matches to work  simply flip it so you re doing    const found   arrayOfStrings find v   gt  v includes str     instead  So if str was set to  ab   found would be set to  abc   Easy peasy

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For full support  additionally to  ricca  s verions     x000D   x000D  wordsArray     hello    to    nice    day   x000D  yourString    Hello  Today is a nice day  toLowerCase   x000D  result   wordsArray every w   gt  yourString includes w   x000D  console log  result    result  x000D   x000D   x000D

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function containsAny str  substrings        for  var i   0  i    substrings length  i             var substring   substrings i          if  str indexOf substring     - 1             return substring                     return null      var result   containsAny  defg     ab    cd    ef     console log  String was found in substring     result

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substringsArray every substring  gt yourBigString indexOf substring      -1    For full support

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building on T J Crowder s answer  using escaped RegExp to test for  at least once  occurrence  of at least one of the substrings    x000D   x000D  function buildSearch substrings    x000D    return new RegExp  x000D      substrings x000D       map function  s   return s replace                     g       amp       x000D       join   1          1    x000D       x000D    x000D   x000D   x000D  var pattern   buildSearch   hello   world     x000D   x000D  console log pattern test  hello there     x000D  console log pattern test  what a wonderful world     x000D  console log pattern test  my name is         x000D   x000D   x000D

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There s nothing built-in that will do that for you  you ll have to write a function for it  If you know the strings don t contain any of the characters that are special in regular expressions  then you can cheat a bit  like this  if  new RegExp substrings join  quot   quot    test string            At least one match       which creates a regular expression that s a series of alternations for the substrings you re looking for  e g   one two  and tests to see if there are matches for any of them  but if any of the substrings contains any characters that are special in regexes        etc    you d have to escape them first and you re better off just doing the boring loop instead  For info about escaping them  see this question s answers  Live Example   x000D   x000D  var substrings     one    two    three    var str      Setup console log  Substrings      substrings join            Try it where we expect a match str    this has one   if  new RegExp substrings join       test str         console log  Match using      str           else       console log  No match using      str               Try it where we DON T expect a match str    this doesn t have any   if  new RegExp substrings join       test str         console log  Match using      str           else       console log  No match using      str           x000D   x000D   x000D    In a comment on the question  Martin asks about the new Array prototype map method in ECMAScript5  map isn t all that much help  but some is  if  substrings some function v    return str indexOf v   gt   0               There s at least one    Live Example   x000D   x000D  var substrings     one    two    three    var str      Setup console log  Substrings      substrings join            Try it where we expect a match str    this has one   if  substrings some function v    return str indexOf v   gt   0            console log  Match using      str           else       console log  No match using      str               Try it where we DON T expect a match str    this doesn t have any   if  substrings some function v    return str indexOf v   gt   0            console log  Match using      str           else       console log  No match using      str           x000D   x000D   x000D   You only have it on ECMAScript5-compliant implementations  though it s trivial to polyfill   Update in 2020  The some example can be simpler with an arrow function  ES2015    and you might use includes rather than indexOf  if  substrings some v   gt  str includes v             There s at least one    Live Example   x000D   x000D  const substrings     one    two    three    let str      Setup console log  Substrings      substrings join            Try it where we expect a match str    this has one   if  substrings some v   gt  str includes v          console log  Match using      str           else       console log  No match using      str               Try it where we DON T expect a match str    this doesn t have any   if  substrings some v   gt  str includes v          console log  Match using      str           else       console log  No match using      str           x000D   x000D   x000D   Or even throw bind at it  although for me the arrow function is much more readable  if  substrings some str includes bind str             There s at least one    Live Example   x000D   x000D  const substrings     one    two    three    let str      Setup console log  Substrings      substrings join            Try it where we expect a match str    this has one   if  substrings some str includes bind str          console log  Match using      str           else       console log  No match using      str               Try it where we DON T expect a match str    this doesn t have any   if  substrings some str includes bind str          console log  Match using      str           else       console log  No match using      str           x000D   x000D   x000D

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You can check like this    lt  DOCTYPE html gt   lt html gt      lt head gt         lt script src  https   ajax googleapis com ajax libs jquery 3 4 1 jquery min js  gt  lt  script gt         lt script gt             document  ready function             var list     bad    words    include             var sentence       comments text   val               each list  function  index  value                if  sentence indexOf value   gt  -1                    console log value                                                 lt  script gt      lt  head gt      lt body gt         lt input id  comments text  value  This is a bad  with include test  gt       lt  body gt   lt  html gt

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This is super late  but I just ran into this problem  In my own project I used the following to check if a string was in an array     a   b   includes  a          true   a   b   includes  b          true   a   b   includes  c          false   This way you can take a predefined array and check if it contains a string   var parameters     a   b   parameters includes  a         true

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var yourstring    tasty food      the string to check against   var substrings     foo   bar        length   substrings length  while length--       if  yourstring indexOf substrings length    -1              one of the substrings is in yourstring

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Drawing from T J  Crowder s solution  I created a prototype to deal with this problem   Array prototype check   function  s      return this some  v    gt        return s indexOf v   gt   0

[javascript] How to check if a string contains text from an array of substrings in JavaScript?

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