Regular Expression Using JavaScript for Removing the Special Characters

Remove all special characters with RegExp

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

As was mentioned in the comments it's easier to do this as a whitelist - replace the characters which aren't in your safelist.

The caret (^) character is the negation of the set [...], gi say global and case-insensitive (the latter is a bit redundant but I wanted to mention it) and the safelist in this example is digits, word characters, underscores (\w) and whitespace (\s).

How to remove special characters from a string using Javascript

Try with this function:

function removeSpecialChars(str) {
  return str.replace(/(?!\w|\s)./g, '')
    .replace(/\s+/g, ' ')
    .replace(/^(\s*)([\W\w]*)(\b\s*$)/g, '$2');
}

1st regex /(?!\w|\s)./g remove any character that is not a word or whitespace. \w is equivalent to [A-Za-z0-9_]
2nd regex /\s+/g find any appearance of 1 or more whitespaces and replace it with one single white space
3rd regex /^(\s*)([\W\w]*)(\b\s*$)/g trim the string to remove any whitespace at the beginning or the end.

Regex to remove specific special characters

Use the string.replace() method and the unicode escape codes for your special characters. You have to use the \ character to escape in JavaScript regex

var str = 'Here is a \' string \" with \" \' some @ special ® characters ™ & &'
str.replace(/['"\u0040\u0026\u2122\u00ae]/g, '')

/pattern/ denotes a regex pattern in JavaScript

[charset] says which set of characters to match

/g specifies global matches so it will replace all occurrences

Remove all special characters except space from a string using JavaScript

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, ""));

Regex remove all special characters except numbers?

Use the global flag:

var name = name.replace(/[^a-zA-Z ]/g, "");
                                    ^

If you don't want to remove numbers, add it to the class:

var name = name.replace(/[^a-zA-Z0-9 ]/g, "");

Javascript - Regex expression to remove special characters from title

You can use

let title = "Pet Supplies (Cat and Dog)"
title = title.toLowerCase()                   // Turn to lower
  .match(/[a-z0-9\s-]+/g)                     // Extract all alnum + hyphen and whitespace chunks
  .map(x => x.trim().split(/\s+/).join("-"))  // Trim the items, split with whitespace and join with a hyphen
  .join("-")                                  // Join the items with a hyphen
  .replace(/-and\b/g, '');                    // Remove whole word -and
console.log(title);

Remove Letters and special characters

If you want to filter out letters and special characters you can use regular expression in JS, like this:

id = id.replace(/\D/g, "")

You replace every (g option) character in your string that is not a digit \D with blank ""

How to remove special characters like $, @, % from string in jquery

You should explore Regex.

Try this:

var str = 'The student have 100% of attendance in @school';str=  str.replace(/[^\w\s]/gi, '')document.write(str);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

regex to remove special characters, spaces and number if first character

You can use following regular expression:

/^\d+|[\W_]+/g

^\d+: to match leading digits (Use ^\d if you want to remove only one leading digit)
\W: to match non word character (reverse of \w: \w matches digit/alphabet/_)
[\W_]: to include _ because \W does not include _

'1 step for man & 2 steps for others 123!'.replace(/^\d+|[\W_]+/g, '')
# => "stepforman2stepsforothers123"
'step for 1 man & 2 steps for others 123!'.replace(/^\d+|[\W_]+/g, '')
# => "stepfor1man2stepsforothers123"

Regex remove special characters in filename except extension

You may remove any chars other than word and dot chars with [^\w.] and any dot not followed with 1+ non-dot chars at the end of the string:

filename = filename.replace(/(?:\.(?![^.]+$)|[^\w.])+/g, "-");

See the regex demo

Details

(?: - start of a non-capturing group:
- \.(?![^.]+$) - any dot not followed with 1+ non-dot chars at the end of the string
- | - or
- [^\w.] - any char other than a word char and a dot char
)+ - end of the group, repeat 1 or more times.

Another solution (if extensions are always present): split out the extension, run your simpler regex on the first chunk then join back:

var filename = "manuel fernandex – Index Prot.bla.otype 5 (pepito grillo).jpg";var ext = filename.substr(filename.lastIndexOf('.') + 1);var name = filename.substr(0, filename.lastIndexOf('.')); console.log(name.replace(/\W+/g, "-") + "." + ext);