Get Substring between two characters using javascript

Question

I am trying to extract a string from within a larger string where it get everything inbetween a   and a   Current Str    MyLongString StringIWant    Desired Output newStr    StringIWant

User · Answer

You can use a higher order function to return a 'compiled' version of your extractor, that way it's faster.

With regexes, and compiling the regex once in a closure, Javascript's match will return all matches.

This leaves us with only having to remove what we used as our markers (ie: {{) and we can use string length for this with slice.

function extract([beg, end]) {
    const matcher = new RegExp(`${beg}(.*?)${end}`,'gm');
    const normalise = (str) => str.slice(beg.length,end.length*-1);
    return function(str) {
        return str.match(matcher).map(normalise);
    }
}

Compile once and use multiple times...

const stringExtractor = extract(['{','}']);
const stuffIneed = stringExtractor('this {is} some {text} that can be {extracted} with a {reusable} function');
// Outputs: [ 'is', 'text', 'extracted', 'reusable' ]

Or single-time use...

const stuffIneed = extract(['{','}'])('this {is} some {text} that can be {extracted} with a {reusable} function');
// Outputs: [ 'is', 'text', 'extracted', 'reusable' ]

Also look at Javascript's replace function but using a function for the replacement argument (You would do that if for example you were doing a mini template engine (string interpolation) ... lodash.get could also be helpful then to get the values you want to replace with ? ...

My answer is too long but it might help someone!

User · Answer

I used  tsds way but by only using the split function   var str    one two three       str split      1  split      0     returns  two    word of caution  if therre is no     in the string accessing  1  index of the array will throw an error  str split      1   therefore  tsds way is safer if there is uncertainty  str split      pop   split      0

User · Answer

Using jQuery    get between  lt - function str  first character  last character        new str   str match first character            last character  1  trim       return new str          string  my string    and the thing that   on the   with the    goes now     usage   get between my string   that    now     result      on the   with the    goes

User · Answer

This could be the possible solution  var str    RACK NO Stock PRODUCT TYPE Stock Sale PART N0 0035719061 INDEX NO 21A627 042 PART NAME SPRING      var newstr   str split      1  split      0      return value as  Stock   console log  stringvalue  newstr

User · Answer

You can also try this   var str    one two three       str split      pop   split      0      returns  two

User · Answer

var number   200  if  number  gt   500    number  lt   600       alert  quot your message quot

User · Answer

A small function I made that can grab the string between  and can  optionally  skip a number of matched words to grab a specific index   Also  setting start to false will use the beginning of the string  and setting end to false will use the end of the string   set pos1 to the position of the start text you want to use  1 will use the first occurrence of start  pos2 does the same thing as pos1  but for end  and 1 will use the first occurrence of end only after start  occurrences of end before start are ignored   function getStringBetween str  start false  end false  pos1 1  pos2 1     var newPos1   0    var newPos2   str length     if start       var loops   pos1      var i   0      while loops  gt  0         if i  gt  str length           break         else if str i     start 0            var found   0          for var p   0  p  lt  start length  p               if str i p     start p                found                                  if found  gt   start length             newPos1   i   start length            loops--                          i                 if end       var loops   pos2      var i   newPos1      while loops  gt  0         if i  gt  str length           break         else if str i     end 0            var found   0          for var p   0  p  lt  end length  p               if str i p     end p                found                                  if found  gt   end length             newPos2   i            loops--                          i                 var result         for var i   newPos1  i  lt  newPos2  i         result    str i         return result

User · Answer

Try this to Get Substring between two characters using javascript              button   click function                var myStr    MyLongString StringIWant                var subStr   myStr match                        alert subStr 1                  Taken from   Find substring between the two characters with jQuery

User · Answer

You can try this  var mySubString   str substring      str lastIndexOf        1       str lastIndexOf

User · Answer

Babasaheb Gosavi Answer is perfect if you have one occurrence of the substrings      and       but once you have multiple occurrences  it might get little bit tricky     The best solution I have came up with to work on multiple projects is using four methods inside an object    First method  is to actually get a substring from between two strings  however it will find only one result   Second method  will remove the  would-be  most recently found result with the substrings after and before it  Third method  will do the above two methods recursively on a string  Fourth method  will apply the third method and return the result      Code  So enough talking  let s see the code   var getFromBetween         results         string         getFromBetween function  sub1 sub2            if this string indexOf sub1   lt  0    this string indexOf sub2   lt  0  return false          var SP   this string indexOf sub1  sub1 length          var string1   this string substr 0 SP           var string2   this string substr SP           var TP   string1 length   string2 indexOf sub2           return this string substring SP TP              removeFromBetween function  sub1 sub2            if this string indexOf sub1   lt  0    this string indexOf sub2   lt  0  return false          var removal   sub1 this getFromBetween sub1 sub2  sub2          this string   this string replace removal                 getAllResults function  sub1 sub2               first check to see if we do have both substrings         if this string indexOf sub1   lt  0    this string indexOf sub2   lt  0  return              find one result         var result   this getFromBetween sub1 sub2              push it to the results array         this results push result              remove the most recently found one from the string         this removeFromBetween sub1 sub2               if there s more substrings         if this string indexOf sub1   gt  -1  amp  amp  this string indexOf sub2   gt  -1                this getAllResults sub1 sub2                     else return             get function  string sub1 sub2            this results               this string   string          this getAllResults sub1 sub2           return this results               How to use   Example   var str    this is the haystack    0       1       2       3       4    some text    5    end of haystack   var result   getFromBetween get str               console log result      returns   0 1 2 3 4 5

User · Answer

Get string between two substrings  contains more than 1 character  function substrInBetween whole str  str1  str2      if  whole str indexOf str1      -1    whole str indexOf str2      -1           return undefined     or  quot  quot        strlength1   str1 length    return whole str substring                  whole str indexOf str1    strlength1                   whole str indexOf str2                           Note I use indexOf   instead of lastIndexOf   so it will check for first occurences  of those strings

User · Answer

var s    MyLongString StringIWant                exec s  1      StringIWant

User · Answer

Use split    var s    MyLongString StringIWant    var arrStr   s split          alert arrStr     arrStr will contain all the string delimited by   or   So access every string through for-loop  for var i 0  i lt arrStr length  i        alert arrStr i

User · Answer

You can also use this one      x000D   x000D  function extractText str delimiter   x000D    if  str  amp  amp  delimiter   x000D      var firstIndex   str indexOf delimiter  1  x000D      var lastIndex   str lastIndexOf delimiter   x000D      str   str substring firstIndex lastIndex   x000D      x000D    return str  x000D    x000D   x000D   x000D  var quotes   document getElementById  quotes    x000D   x000D      amp  34 - represents quotation mark in HTML x000D   lt div gt  x000D   x000D   x000D     lt div gt  x000D     x000D       lt span id  at  gt  x000D        My string is  between  the  at  sign x000D       lt  span gt  x000D       lt button onclick  document getElementById  at   innerText   extractText document getElementById  at   innerText       gt Click lt  button gt  x000D     x000D     lt  div gt  x000D     x000D     lt div gt  x000D       lt span id  quotes  gt  x000D        My string is  between  quotes chars x000D       lt  span gt  x000D       lt button onclick  document getElementById  quotes   innerText   extractText document getElementById  quotes   innerText   amp  34    gt Click lt  button gt  x000D     x000D     lt  div gt  x000D   x000D   lt  div gt  x000D   x000D   x000D

User · Answer

To get all substring  var out        MyLongString StringIWant    replace      w      g   e    gt        out push e replace          replace               return e      console log out 0

User · Answer

function substringBetween s  a  b        var p   s indexOf a    a length      return s substring p  s indexOf b  p          substringBetween  MyLongString StringIWant              - gt  StringIWant    substringBetween  MyLongString StringIWant               - gt  StringIWant    substringBetween  MyLongString StringIWant  StringIDontWant              - gt  StringIWant

User · Answer

var str     basic salary  100  basic salary    var arr   str split      var myArr       for var i 0 i lt arr length i         if arr i                   var a               for var j i 1 j lt arr length j                 if arr j                           var i   j-1                  break               else                  a    arr j                                   myArr push a             var operatorsArr         -                    if operatorsArr includes arr i             myArr push arr i              var numbArr     0   1   2   3   4   5   6   7   8   9        if numbArr includes arr i             var a               for var j i j lt arr length j                 if numbArr includes arr j                     a    arr j                else                  var i   j-1                  break                                  myArr push a           myArr     quot basic salary quot    quot   quot    quot 100 quot    quot   quot    quot basic salary quot

User · Answer

If you want to extract all substrings from a string  that occur between two delimiters  different or same   you can use this function  It returns an array with all substrings found  function get substrings between str  startDelimiter  endDelimiter         var contents           var startDelimiterLength   startDelimiter length      var endDelimiterLength   endDelimiter length      var startFrom   contentStart   contentEnd   0           while false      contentStart   strpos str  startDelimiter  startFrom                   contentStart    startDelimiterLength          contentEnd   strpos str  endDelimiter  contentStart           if false     contentEnd                         break                    contents push  str substr contentStart  contentEnd - contentStart             startFrom   contentEnd   endDelimiterLength             return contents        https   stackoverflow com a 3978237 1066234 function strpos haystack  needle  offset         var i    haystack     indexOf needle   offset    0        return i     -1   false   i        Example usage var string    quot We want to extract all infos  essential ones  from within the brackets  this should be fun   quot   var extracted   get substrings between string             console log extracted       output   2     quot essential ones quot    quot this should be fun quot    Orginally from PHP by raina77ow  ported to Javascript

User · Answer

I like this method   var str    MyLongString StringIWant    var tmpStr    str match            var newStr   tmpStr 1     newStr now contains  StringIWant

[javascript] Get Substring between two characters using javascript

Examples related to javascript

Examples related to regex

Examples related to string

Examples related to substring