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Editorial Team
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Asked: 2026-06-05T21:43:05+00:00

I need to detect IE7 (and IE6) using the user agent string: I have

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I need to detect IE7 (and IE6) using the user agent string:

I have made the following regex:

navigator.userAgent.match(/MSIE [67]\./)

However, IE9 in quirks mode also matches the regex with the following user agent:

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 7.1; Trident/5.0; .NET CLR 2.0.50727; SLCC2; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C)

I could make two regexes:

navigator.userAgent.match(/MSIE [67]\./) !== null 
  && navigator.userAgent.match(/Trident\/5\.0/) === null

Is there a way I can combine them into one?

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1 Answer

  1. Editorial Team

    Assuming the Trident part always comes after the MSIE part, you can use a lookahead:

    /MSIE [67]\.(?!.*Trident[5]\.0)/

    I’m not familiar with user agents strings, but I’m guessing that maybe IE10 in quirks mode could have a Trident version > 5, so you could change it to:

    /MSIE [67]\.(?!.*Trident[1-9])/

    UPDATE: second regex edited to include earlier versions of Trident too, e.g. Trident/4.0 in IE8, as well as potential later versions >= 10.

    UPDATE2: Cleaned up RegEx’s to be valid in javascript.

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