How to remove text from a string

Question

I ve got a data-123 string   How can I remove data- from the string while leaving the 123

User · Answer

I was used to the C   Sharp  String Remove method  In Javascript  there is no remove function for string  but there is substr function  You can use the substr function once or twice to remove characters from string  You can make the following function to remove characters at start index to the end of string  just like the c  method first overload String Remove int startIndex    function Remove str  startIndex        return str substr 0  startIndex       and or you also can make the following function to remove characters at start index and count  just like the c  method second overload String Remove int startIndex  int count    function Remove str  startIndex  count        return str substr 0  startIndex    str substr startIndex   count       and then you can use these two functions or one of them for your needs   Example   alert Remove  data-123   0  5      Output  123

User · Answer

You can use  data-123  replace  data-        as mentioned  but as replace   only replaces the FIRST instance of the matching text  if your string was something like  data-123data-  then   data-123data-  replace  data-         will only replace the first matching text  And your output will be  123data-   DEMO  So if you want all matches of text to be replaced in string you have to use a regular expression with the g flag like that    data-123data-  replace  data- g        And your output will be  123   DEMO2

User · Answer

This little function I made has always worked for me    String prototype deleteWord   function  searchTerm        var str   this      var n   str search searchTerm       while  str search searchTerm   gt  -1            n   str search searchTerm           str   str substring 0  n    str substring n   searchTerm length  str length             return str        Use it like this  var string    quot text is the cool   quot   string deleteWord  the       Returns text is cool    I know it is not the best  but It has always worked for me

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Using match   and Number   to return a number variable   Number   data-123   match   d           strNum   123   Here s what the statement above does   working middle-out    str match   d     - returns an array containing matches to any length of numbers at the end of str  In this case it returns an array containing a single string item   123    Number   - converts it to a number type  Because the array returned from  match   contains a single element Number   will return the number

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Performance Today 2021 01 14 I perform tests on MacOs HighSierra 10 13 6 on Chrome v87  Safari v13 1 2 and Firefox v84 for chosen solutions  Results For all browsers  solutions Ba  Cb  and Db are fast fastest for long strings solutions Ca  Da are fast fastest for short strings solutions Ab and E  are slow for long strings solutions Ba  Bb and F are slow for short strings   Details I perform 2 tests cases   short string - 10 chars - you can run it HERE long string - 1 000 000 chars - you can run it HERE  Below snippet presents solutions Aa Ab Ba Bb Ca Cb Da Db E F  x000D   x000D     https   stackoverflow com questions 10398931 how-to-strToRemove-text-from-a-string     https   stackoverflow com a 10398941 860099 function Aa str strToRemove      return str replace strToRemove            https   stackoverflow com a 63362111 860099 function Ab str strToRemove      return str replaceAll strToRemove            https   stackoverflow com a 23539019 860099 function Ba str strToRemove      let re   strToRemove replace                     g       amp        regexp escape char   return str replace new RegExp re             https   stackoverflow com a 63362111 860099 function Bb str strToRemove      let re   strToRemove replace                     g       amp        regexp escape char   return str replaceAll new RegExp re  g              https   stackoverflow com a 27098801 860099 function Ca str strToRemove      let start   str indexOf strToRemove     return str slice 0 start    str slice start strToRemove length  str length         https   stackoverflow com a 27098801 860099 function Cb str strToRemove      let start   str search strToRemove     return str slice 0 start    str slice start strToRemove length  str length         https   stackoverflow com a 23181792 860099 function Da str strToRemove      let start   str indexOf strToRemove     return str substr 0  start    str substr start   strToRemove length         https   stackoverflow com a 23181792 860099 function Db str strToRemove      let start   str search strToRemove     return str substr 0  start    str substr start   strToRemove length         https   stackoverflow com a 49857431 860099 function E str strToRemove      return str split strToRemove  join            https   stackoverflow com a 45406624 860099 function F str strToRemove        var n   str search strToRemove       while  str search strToRemove   gt  -1            n   str search strToRemove           str   str substring 0  n    str substring n   strToRemove length  str length             return str      let str    data-123   let strToRemove    data-     Aa Ab Ba Bb Ca Cb Da Db E F  map  f  gt  console log    f name padEnd 2         f str strToRemove       x000D  This shippet only presents functions used in performance tests - it not perform tests itself  x000D   x000D   x000D   And here are example results for chrome

User · Answer

This doesn t have anything to do with jQuery  You can use the JavaScript replace function for this   var str    data-123   str   str replace  data-          You can also pass a regex to this function  In the following example  it would replace everything except numerics   str   str replace    0-9     g

User · Answer

x000D   x000D  var ret    data-123  replace  data-       x000D  console log ret       prints  123 x000D   x000D   x000D    Docs     For all occurrences to be discarded use   var ret    data-123  replace  data- g        PS  The replace function returns a new string and leaves the original string unchanged  so use the function return value after the replace   call

User · Answer

str split  Yes   join  No       This will replace all the occurrences of that specific string from original string

User · Answer

Ex -  var value  Data-123   var removeData value replace  Data-       alert removeData     Hopefully this will work for you

User · Answer

Plain old JavaScript will suffice - jQuery is not necessary for such a simple task   var myString    data-123   var myNewString   myString replace  data-          See   replace   docs on MDN for additional information and usage

User · Answer

Another way to replace all instances of a string is to use the new  as of August 2020  String prototype replaceAll   method  It accepts either a string or RegEx as its first argument  and replaces all matches found with its second parameter  either a string or a function to generate the string  As far as support goes  at time of writing  this method has adoption in current versions of all major desktop browsers   even Opera    except IE  For mobile  iOS SafariiOS 13 7   Android Chromev85   and Android Firefoxv79  are all supported as well    This includes Edge  Chrome v85   Firefox v77   Safari 13 1   and Opera v71  It ll take time for users to update to supported browser versions  but now that there s wide browser support  time is the only obstacle  References   MDN Can I Use - Current Browser Support Information TC39 Proposal Repo for  replaceAll    You can test your current browser in the snippet below   x000D   x000D    Example coutesy of MDN  https   developer mozilla org en-US docs Web JavaScript Reference Global Objects String replaceAll const p    The quick brown fox jumps over the lazy dog  If the dog reacted  was it really lazy     const regex    dog gi   try     console log p replaceAll regex   ferret          expected output   The quick brown fox jumps over the lazy ferret  If the ferret reacted  was it really lazy      console log p replaceAll  dog    monkey          expected output   The quick brown fox jumps over the lazy monkey  If the monkey reacted  was it really lazy     console log  Your browser is supported       catch  e      console log  Your browser is unsupported          x000D   as-console-wrapper      max-height  100   important    x000D   x000D   x000D

User · Answer

you can use slice   it returens charcters between start to end  included end point      string slice start   end     here is some exmp to show how it works     var mystr     data-123   slice 5      jast define start point so output is  123  var mystr     data-123   slice 5 7      define start and end  so output is  12  var mystr    246   slice 1      returens  246    Demo

[javascript] How to remove text from a string?

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