JavaScript: what is the regex to trim other than A-Z a-z 0-9 and symbols?

Question

JavaScript: what is the regex to trim other than A-Z a-z 0-9 and symbols?

Reading some text file by fs of node.js/Windows results awkward data that contains invisible characters.

String.length indicates the data contains many redundant invisible characters.

Trying to trim by js String.trim does not work well, so I try to remove them using String.replace with regex.

So, here's my question.

what is the regex to trim other than A-Z a-z 0-9 and symbols?

Space should be preserved (not the target to trim).

Thanks.

javascript
regex
string
node.js

Answer 1

You could use a negated class like:

[^A-Za-z0-9\s]

Btw, you also can shorten it to:

[^A-Za-z\d\s]

And.. if you don't mind to preserve underscores your could use:

[^\w\s]

The idea of the negated class is to not match the characters in it. For this regex:

[^A-Za-z0-9\s]

it means:

^       ---> not match the following
A-Za-z  ---> letters from a-z insensitive
\d      ---> digits from 0 to 9
\s      ---> spaces, tabs, etc (whitespaces)

Working demo

enter image description here

Answer 2

Add your symbols to the class you have designated as non-replacable.

[^a-zA-Z0-9\s add symbols here]+