CODEWITHSUNDEEP
javascriptspecial-characters
nithi
nithi

Reputation: 3877

Remove all special characters except space from a string using JavaScript

I want to remove all special characters except space from a string using JavaScript.

For example, abc's test#s should output as abcs tests.

Upvotes: 276

Views: 737111

Answers (13)

Munna Kumar
Munna Kumar

Reputation: 535

With regular expression

let string  = "!#This tool removes $special *characters* /other/ than! digits, characters and spaces!!!$";

var NewString= string.replace(/[^\w\s]/gi, '');
console.log(NewString);

Result //This tool removes special characters other than digits characters and spaces

Live Example : https://helpseotools.com/text-tools/remove-special-characters

Upvotes: 8

Abdullah Al Mamun
Abdullah Al Mamun

Reputation: 119

const str = "abc's@thy#^g&test#s";
console.log(str.replace(/[^a-zA-Z ]/g, ""));

Upvotes: 11

Muneeb Ahmed
Muneeb Ahmed

Reputation: 31

Try this:

const strippedString = htmlString.replace(/(<([^>]+)>)/gi, "");
console.log(strippedString);

Upvotes: 0

Shrinivasan
Shrinivasan

Reputation: 281

Try to use this one

var result= stringToReplace.replace(/[^\w\s]/g, '')

[^] is for negation, \w for [a-zA-Z0-9_] word characters and \s for space, /[]/g for global

Upvotes: 8

sudheer nunna
sudheer nunna

Reputation: 1719

const input = `#if_1 $(PR_CONTRACT_END_DATE) == '23-09-2019' # 
Test27919<[email protected]> #elseif_1 $(PR_CONTRACT_START_DATE) ==  '20-09-2019' #
Sender539<[email protected]> #elseif_1 $(PR_ACCOUNT_ID) == '1234' #
AdestraSID<[email protected]> #else_1#Test27919<[email protected]>#endif_1#`;
const replaceString = input.split('$(').join('->').split(')').join('<-');


console.log(replaceString.match(/(?<=->).*?(?=<-)/g));

Upvotes: -1

Petar Ivanov
Petar Ivanov

Reputation: 93020

You should use the string replace function, with a single regex. Assuming by special characters, you mean anything that's not letter, here is a solution:

const str = "abc's test#s";
console.log(str.replace(/[^a-zA-Z ]/g, ""));

Upvotes: 567

Seagull
Seagull

Reputation: 3600

The first solution does not work for any UTF-8 alphabet. (It will cut text such as Привіт). I have managed to create a function which does not use RegExp and use good UTF-8 support in the JavaScript engine. The idea is simple if a symbol is equal in uppercase and lowercase it is a special character. The only exception is made for whitespace. 

function removeSpecials(str) {
    var lower = str.toLowerCase();
    var upper = str.toUpperCase();

    var res = "";
    for(var i=0; i<lower.length; ++i) {
        if(lower[i] != upper[i] || lower[i].trim() === '')
            res += str[i];
    }
    return res;
}

Update: Please note, that this solution works only for languages where there are small and capital letters. In languages like Chinese, this won't work.

Update 2: I came to the original solution when I was working on a fuzzy search. If you also trying to remove special characters to implement search functionality, there is a better approach. Use any transliteration library which will produce you string only from Latin characters and then the simple Regexp will do all magic of removing special characters. (This will work for Chinese also and you also will receive side benefits by making Tromsø == Tromso).

Upvotes: 35

dovid
dovid

Reputation: 6452

search all not (word characters || space):

str.replace(/[^\w ]/, '')

Upvotes: 16

Mozfet
Mozfet

Reputation: 369

I tried Seagul's very creative solution, but found it treated numbers also as special characters, which did not suit my needs. So here is my (failsafe) tweak of Seagul's solution...

//return true if char is a number
function isNumber (text) {
  if(text) {
    var reg = new RegExp('[0-9]+$');
    return reg.test(text);
  }
  return false;
}

function removeSpecial (text) {
  if(text) {
    var lower = text.toLowerCase();
    var upper = text.toUpperCase();
    var result = "";
    for(var i=0; i<lower.length; ++i) {
      if(isNumber(text[i]) || (lower[i] != upper[i]) || (lower[i].trim() === '')) {
        result += text[i];
      }
    }
    return result;
  }
  return '';
}

Upvotes: 10

hassanf1
hassanf1

Reputation: 1

dot (.) may not be considered special. I have added an OR condition to Mozfet's & Seagull's answer:

function isNumber (text) {
      reg = new RegExp('[0-9]+$');
      if(text) {
        return reg.test(text);
      }
      return false;
    }

function removeSpecial (text) {
  if(text) {
    var lower = text.toLowerCase();
    var upper = text.toUpperCase();
    var result = "";
    for(var i=0; i<lower.length; ++i) {
      if(isNumber(text[i]) || (lower[i] != upper[i]) || (lower[i].trim() === '') || (lower[i].trim() === '.')) {
        result += text[i];
      }
    }
    return result;
  }
  return '';
}

Upvotes: 0

Lakshmana Kumar D
Lakshmana Kumar D

Reputation: 2273

You can do it specifying the characters you want to remove:

string = string.replace(/[&\/\\#,+()$~%.'":*?<>{}]/g, '');

Alternatively, to change all characters except numbers and letters, try:

string = string.replace(/[^a-zA-Z0-9]/g, '');

Upvotes: 210

Thiago Moraes
Thiago Moraes

Reputation: 617

I don't know JavaScript, but isn't it possible using regex?

Something like [^\w\d\s] will match anything but digits, characters and whitespaces. It would be just a question to find the syntax in JavaScript.

Upvotes: 14

Gaurav Agrawal
Gaurav Agrawal

Reputation: 4431

Whose special characters you want to remove from a string, prepare a list of them and then user javascript replace function to remove all special characters.

var str = 'abc'de#;:sfjkewr47239847duifyh';
alert(str.replace("'","").replace("#","").replace(";","").replace(":",""));

or you can run loop for a whole string and compare single single character with the ASCII code and regenerate a new string.

Upvotes: -17

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