Regular expression in javascript for restricting HTML entites like <

Question

Hii,

I want to restrict the html entities like '<' , ">" , "&"etc but it should accept '<' and '>' when i click on a button from the javascript. Can anybody gives me the regular expression for that

How about ©, 〹, ꯍ and ordinal text like foo? Do you just want to strip HTML tags like <script>? <b>? — kennytm
– kennytm, Commented Jun 25, 2010 at 6:54
No i want accept all the html tags but if it the content is in the encodeed format that should be avoided — Jibu P C_Adoor
– Jibu P C_Adoor, Commented Jun 25, 2010 at 6:56

Brock Adams · Accepted Answer · 2010-06-28 11:25:26Z

11

Updated regex for all entities, including numeric...

Javascript like:

var StrippedStr = YourStrVar.replace (/&#{0,1}[a-z0-9]+;/ig, "");

will strip just about every ~~non-numeric~~ html entity.

.

UPDATE:

Based on comment:

   "but i want to identify the specified string contains &lt;"

.

You can test for entities with:

var HasEntity = /&#{0,1}[a-z0-9]+;/i. test (YourStrVar);

.

You can get a list of the entities with:

var ListOfEntities = YourStrVar.match (/&#{0,1}[a-z0-9]+;/ig);

for (var J=0;  J < ListOfEntities.length;  J++)
{
    alert ('Entity ' + (J+1) + '= ' + ListOfEntities[J]);
}

edited Jun 28, 2010 at 11:25

answered Jun 25, 2010 at 7:14

Brock Adams

94k23 gold badges242 silver badges312 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Gumbo Over a year ago

You can write {0,1} as ?.

Brock Adams Over a year ago

@Gumbo: True, but not my style.

Gumbo Over a year ago

Not your style? What is your style? You should always write your code as comprehensible as possible. Quantifiers like ? and + were added for the same reason to not to be forced to write something like (x|) but simply x? and not xx* but simply x+.

M3t0r · Accepted Answer · 2010-06-25 07:10:55Z

0

maybe that?

function remove() {
  var buffer = document.getElementById("parent").innerHTML;
  buffer = buffer.replace(/'&lt;'/, "");
  buffer = buffer.replace(/'&gt;'/, "");
  buffer = buffer.replace(/'&amp;'/, "");
  document.getElementById("parent").innerHTML = buffer;
}

just adujst the id

answered Jun 25, 2010 at 7:10

M3t0r

1829 bronze badges

1 Comment

Jibu P C_Adoor Over a year ago

It will replace the specified string to empty string, but i want to identify the specified string contains '<'

Collectives™ on Stack Overflow

Regular expression in javascript for restricting HTML entites like <

2 Answers 2

UPDATE:

3 Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

UPDATE:

3 Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related