RegEx for value 0.1 to 100.00 - regex

Question

Looking at the xml file created by HitManPro I can see numerous entries like this one;
[Item type="Malware" malwareName="Trojan" score="0.0" status="None"]
This are the false positives.
I would like to replace the existing RegEX query that I use in a script (LabTech) with one that would look for anything like;
score="5.1" up to score="999.0"
I am new to Reg Ex queries, and I am having trouble building the search for digits inside the string score=" " .
Any help would be much appreciated. Below is a sample XML from hitmanPro
regards,
Oscar Romero
<br>
HitmanPro Scan Completed Successfully.
Threats Found!
<hr>
Scan Date: 2015-10-17T15:16:31<BR>
<p>"
[Log computer="computer name" windows="6.1.1.7601.X64/12" scan="Normal" version="3.7.9.246" date="2015-10-17T15:16:31" timeSpentInSecs="125" filesProcessed="15922"]
[Item type="Malware" malwareName="Malware" score="90.0" status="None"]
[Scanners]
[Scanner id="Bitdefender" name="Gen:Variant.Kazy.751212" /]
[/Scanners]
[File path="C:\Program Files (x86)\ESET\ESET Remote Administrator\Server\era.exe" hash="F7BB46D48B994539AFD400641CE8E4F85114FC7BA05A1BAA0D092F3A92817F13" /]
[Startup]
[Key path="HKLM\SYSTEM\CurrentControlSet\Services\ERA_SERVER\" /]
[/Startup]
[/Item]
[/Log]
"</p>

Answer 1

There must be a shorter version than this, but this should work.
score="(0\.[1-9]|[1-9]\.[0-9]|[1-9][0-9]\.[0-9]|[1-9][0-9][0-9]\.[0-9])"
Matches:
0.1
1.0
10.4
100.9
100.0
999.9
99.9
9.9
(etc.)
Does Not Match
0.0
0
(etc.)
Is regex the way to go?
As for whether regex is the right tool for the job, I probably agree with #Makoto that it isn't - unless you're doing a quick scan of the results as an FYI, rather than filtering results as part of a larger tool or application. In other words, except for the simplest cases, I agree with #Makoto that you want some xml parsing tool.

Answer 2

I have no idea on LabTech.
Anyway, the regex query that you can use:
\sscore="((?:5\.[1-9])|(?:[6-9]\.[0-9])|(?:[1-9]{1}[0-9]{1,2}\.[0-9]))"\s
or
\sscore="(5\.[1-9]|[6-9]\.[0-9]|[1-9]{1}[0-9]{1,2}\.[0-9])"\s
if you prefer without the (?: ... )
UPDATE:
Okay, I made further changes to support the 5.1 minimum, and max 999.9
PS: This is my first answer on StackOverflow