Jquery Invisible string in input text

Question

Hi guys please help me with this.

i have some issue regarding some email validation that doesn't match my regex. What's my issues all about was i think are \n or \r but when i try

var count = $("input#email_address").val().length;

Got the result of 25 when copy from excel to my text box VS Manual input with the same text and the result is 24 characters.

var str = $("input#email_address").val().replace(/\r?\n/g, "");

i tried this and trim() and match to find \r \n or whitespaces but return null.

did i missed something here? im new to jquery and javascript. — Bug Man, Oct 25 '16 at 19:51
Try this, excel adds more tabs var str = $("input#email_address").val().replace(/[\r\n\t]/g, ""); — MoustafaS, Oct 25 '16 at 19:52
Take a look at the answers here. It might help http://stackoverflow.com/questions/1144783/replacing-all-occurrences-of-a-string-in-javascript — applecrusher, Oct 25 '16 at 19:53
@MoustafaS i tried it but still counts as 25 character instead of 24 :( — Bug Man, Oct 25 '16 at 19:53
@adeneo yeah i tried that after i get the value from input text. — Bug Man, Oct 25 '16 at 19:54
Related link, but probably not helpful :) https://davidcel.is/posts/stop-validating-email-addresses-with-regex/ — William B, Oct 25 '16 at 20:21
This is the scariest string i found in my input text value after using escape(str) command in js. it outputs "%u200Btest@test.com" holy god where did it came from? it should be "test@test.com" — Bug Man, Oct 25 '16 at 20:46

score 1 · Answer 1 · edited May 23 '17 at 10:34

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First remove all unreadable characters, just in case:

var str = $("input#email_address").val().replace(/[\x00-\x1f]+/g, "");

Then, you should also check if some special characters in the string are multibyte. In that case, you need a more elaborated approach, see:

String length in bytes in JavaScript

edited May 23 '17 at 10:34

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answered Oct 25 '16 at 20:12

Javier Rey

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score 1 · Accepted Answer · edited May 23 '17 at 12:10

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Okay in case you encounter this. Here's the solution.

I checked the value of my input text by calling escape(str), and i got the result "%u200Btest@test.com" it should be "test@test.com" they called this zero width space(correct me if i'm wrong".

and here's the fix.

str = str.replace(/\u200B/g,'');

JavaScript remove ZERO WIDTH SPACE (unicode 8203) from string

edited May 23 '17 at 12:10

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answered Oct 25 '16 at 20:54

Bug Man

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Jquery Invisible string in input text

2 Answers2