"Employing regular expressions to extract the name of the web browser

Experiencing issues with regular expressions in JavaScript. Attempting to extract the version number and browser name, such as "Firefox 22.0" or "MSIE 8.0".

console.log(navigatorSaysWhat())

function navigatorSaysWhat()
{
  var rexp = new RegExp(/(firefox|msie|chrome|safari)\s(\d+)(\.)(\d+)/i);
  // works in ie but not in firefox
  var userA = navigator.userAgent
  var nav = userA.match(rexp);
  return nav
 }

The current expression is not quite achieving the desired result. The goal is to match the browser name and version number from the strings.

Examples of user agent strings: Mozilla/5.0 (Windows NT 5.1; rv:22.0) Gecko/20100101 Firefox/22.0 Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0;

Attempts have been made to adjust the expression, such as using (firefox|msie|chrome|safari)\s(\d+)(./\/)(\d+) to match the backslash, or (firefox|msie|chrome|safari)\s(\d+)(*)(\d+) for any character, but without success.

javascriptregex

Answer №1

Regular expressions are case-sensitive. To ignore case, you can use (?i) or other methods provided by the regular expression engine you are working with.

(?i)(firefox|msie|chrome|safari)[/\s]([\d.]+)

For example, here's a Python code snippet.

>>> agents = 'Mozilla/5.0 (Windows NT 5.1; rv:22.0) Gecko/20100101 Firefox/22.0 Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET CLR 1.1.4322; .NET4.0C'
>>> [[m.group(1), m.group(2)] for m in re.finditer(r'(?i)(firefox|msie|chrome|safari)[\/\s]([\d.]+)', agents)]
[['Firefox', '22.0'], ['MSIE', '8.0']]

And here is the equivalent in Javascript:

var agents = 'Mozilla/5.0 (Windows NT 5.1; rv:22.0) Gecko/20100101 Firefox/22.0 Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET CLR 1.1.4322; .NET4.0C';
agents.match(/(firefox|msie|chrome|safari)[/\s]([\d.]+)/ig)
=> ["Firefox/22.0", "MSIE 8.0"]

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