Using Regex to parse browser-version from User-Agent-Header

Question

Parsing the user-agent header I need to find out if I am dealing with IE-8 or earlier:

<= IE8

So the regex should return true in the following cases:

(compatible; MSIE 8.0;...)
(compatible; MSIE 7.0;...)
etc.

The following should yield false:

(compatible; MSIE 9.0;...)

This following regex does not work:

"MSIE [6-8]\."

This works for me: "(?i).*MSIE [5-8]\..*"

recalcitrant
– recalcitrant

2012-02-16 11:07:51 +00:00
Commented Feb 16, 2012 at 11:07 — recalcitrant
– recalcitrant, Commented Feb 16, 2012 at 11:07

Robjong · Accepted Answer · 2012-02-16 00:47:38Z

4

Your pattern should work if you escape the backslash, or did you mean JavaScript?. (in which case it should work)

"(?i)MSIE\\s+[5-8]\\.\\d+"

Explanation:

(?i) makes the match case insensitive
MSIE matches the string MSIE
\\s+ one or more spaces
[5-8] matches digits 5 to 8
\\. match a dot
\\d+ one or more digits

edited Feb 16, 2012 at 0:47

answered Feb 15, 2012 at 23:52

Robjong

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1 Comment

recalcitrant Over a year ago

It still does not work if I use java.regex (with Scala): val ieMatcher = """(?i)MSIE\\s+[5-8]\\.\\d+""".r.pattern def isIE(str: String) = ieMatcher.matcher(str).matches()

Alex Nikolaenkov · Accepted Answer · 2012-02-15 23:06:08Z

0

You can use character groups to match versions, f.i. [678]\.0.

answered Feb 15, 2012 at 23:06

Alex Nikolaenkov

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