Differences in Regular Expressions between Chrome and Internet Explorer

Question

Differences in Regular Expressions between Chrome and Internet Explorer

I'm working with this regular expression:

var SSN_REGEX = /^[A-Åa-å0-9,\!\-\?\""\. ]{3,999}$/;

This regex is used in a JavaScript function where I check for social security numbers.

function validateSSN(ssn){

 if (SSN_REGEX.test(ssn)) {    
  javascript:addAppointment(document.forms[0])
  alert("Valid SSN");
 } else {
    alert("Invalid SSN");
 }
}

It's interesting that when I enter 12345Test in Chrome, the regex passes without any issues. However, in Internet Explorer, strings cannot start with numbers causing some trouble. It feels like IE was specifically designed to make my life difficult. Any suggestions on how to tackle this issue?

javascript regex

Answer 1

Answer №1

The issue lies within the construction A-Åa-å as it is being interpreted differently. Internet Explorer does not recognize that T falls within that range.

This problem may stem from character set detection. Have you encoded the script in UTF-8? Is there a UTF-8 BOM at the beginning? If not, adding one might help ensure consistent behavior across browsers.

Furthermore, the use of A-Åa-å in your regex seems peculiar. It may be beneficial to modify the regex to include more natural character ranges, such as A-Za-zÅå, or even expand the ranges altogether.

Answer 2

The issue lies within the construction A-Åa-å as it is being interpreted differently. Internet Explorer does not recognize that T falls within that range.

This problem may stem from character set detection. Have you encoded the script in UTF-8? Is there a UTF-8 BOM at the beginning? If not, adding one might help ensure consistent behavior across browsers.

Furthermore, the use of A-Åa-å in your regex seems peculiar. It may be beneficial to modify the regex to include more natural character ranges, such as A-Za-zÅå, or even expand the ranges altogether.

Answer 3

Answer №2

For those looking to include both numbers and letters from the Norwegian alphabet, here is a regular expression using unicode sequences that might be helpful:

var RE_SSN = /^[a-zA-Z\u00C5\u00C6\u00D8\u00E5\u00E6\u00F8\!\-\?\""\. ]{3,999}$/;

With the following representations:

\u00C5 > Å  
\u00C6 > Æ   
\u00D8 > Ø  
\u00E5 > å  
\u00E6 > æ  
\u00F8 > ø

I hope this explanation proves useful.

Answer 4

For those looking to include both numbers and letters from the Norwegian alphabet, here is a regular expression using unicode sequences that might be helpful:

var RE_SSN = /^[a-zA-Z\u00C5\u00C6\u00D8\u00E5\u00E6\u00F8\!\-\?\""\. ]{3,999}$/;

With the following representations:

\u00C5 > Å  
\u00C6 > Æ   
\u00D8 > Ø  
\u00E5 > å  
\u00E6 > æ  
\u00F8 > ø

I hope this explanation proves useful.

Differences in Regular Expressions between Chrome and Internet Explorer

Answer №1

Answer №2

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