Regex Javascript escape special characters plus characters limit

Question

Can anyone help me with this regex? I need something which allow: 0-9 a-z A-Z spaces commas hyphens apostrophes and these other special characters: _@=.` plus at the same time set characters limit into it.

I've got this now but it's throwing invalid regular expression exception.

var regex = /^\s*([0-9a-zA-Z\s\,\-\(\)\'\_\@\~\&\*\=\.\`]{1,35}+)\s*$/;
        return this.optional(element) || value.match(regex);
       }, "Please enter a valid name"    );

Thanks for any help!

{1,35}+ Whats this expected to do? Either the one, or the other. Both together doesn't make a lot of sense. — tkausl
– tkausl, Commented Jan 21, 2019 at 6:10
sorry, im new to regex .. i added {1,35} thinking that it will help to validate the character limit (minimum 1 and max 35 characters) — vlina
– vlina, Commented Jan 21, 2019 at 6:13
Yeah, makes sense. But then adding + which means one or more is pointless. — tkausl
– tkausl, Commented Jan 21, 2019 at 6:16
@tkausl Plus sign in this context doesn't mean one or more. It changes the previous quantifier to possessive. Check this — Egan Wolf
– Egan Wolf, Commented Jan 21, 2019 at 6:18
i see, i didn't know that the + sign means so initially, thanks for the help! it works perfectly now :) — vlina
– vlina, Commented Jan 21, 2019 at 6:19

FZs · Accepted Answer · 2019-01-21 06:18:41Z

1

Remove + after {1,35} and escape only special characters:

var regex = /^\s*([0-9a-zA-Z\s,\-()'_@~&*=.`]{1,35})\s*$/;

console.log(regex.test(" asdfghjkl "))
console.log(regex.test(" asdf'&@() "))
console.log(regex.test(" asdfghjklasdfghjklasdfghjklasdfghjklasdfghjkl "))

answered Jan 21, 2019 at 6:18

FZs

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Community · Accepted Answer · 2020-06-20 09:12:55Z

Anything Meta Sequence Combo

It looks like you want anything. If so use:

/[\S\s]{1,35}/g

The brackets [...] means one character within it is a match.

\s is any space.

\S is any non-space.

and {1,35} means one to thirty-five consecutive matches of whatever preceded it.

Demo

Features the way to get the first 1 to 35 characters and also every 1 to 35 characters

var str = `1234567~!@#$%^&*e()_+_{}{:>><rthjokyuym.,iul[.<>LOI*&^%$#@!@#$%^&*()_+_{}{:>><KJHBGNJMKL>|}{POIUY~!@#$%^&*(+_)O(IU`;

var rgx = /[\s\S]{1,35}/g;

var res = rgx.exec(str);

console.log(`==== The first 35 characters ===========================`);
console.log(res[0]);
console.log(' ');
console.log(`==== OR for every 1 to 35 characters ===================`);
while (res !== null) {
  console.log(res[0]);
  var res = rgx.exec(str);
}

.as-console-wrapper {
  min-height: 100%;
}

div div div.as-console-row:first-of-type,
div div div.as-console-row:nth-of-type(4) {
  color: tomato
}

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