Need help using powershell to search a string

You can extract that value with a Regular Expression.
This will match "Experts-Exchange", followed by any number of spaces, and then matches any amount of digits or dots.
The match will be in a named group "Value"
If you can give us more information about the exact expected/allowed format of the value you want, the RegEx could be more specific than just "any amount of digits or dots".

Experts-Exchange\s*(?<Value>[0-9.]+)

Select allOpen in new window

"GFiYXNlaWQ9NTAwJmFtcDtzZXJpYWw9MTY4NTEwODQmYW1wO2Vt      Experts-Exchange               14.92" -match 'Experts-Exchange\s+(?<Value>[0-9.]+)'
$value = $Matches['Value']
$value

Select allOpen in new window

It will be one of the following
x.xx
xx.xx
xxx.xx

Then the RegEx would be

Experts-Exchange\s+(?<Value>\d{1,3}\.\d{2})(\D|$)

Select allOpen in new window

1-3 digits, followed by a dot, followed by exactly two digits, followed by either a non-digit or the end of the string.
If the match evaluates to $false, the pattern couldn't be found.

"GFiYXNlaWQ9NTAwJmFtcDtzZXJpYWw9MTY4NTEwODQmYW1wO2Vt      Experts-Exchange               14.92" -match 'Experts-Exchange\s+(?<Value>\d{1,3}\.\d{2})(\D|$)'
$value = $Matches['Value']
$value

Select allOpen in new window

What would be the full URL, not just the string?

The URL changes, so you cannot search based off the full content of the URL.  I'm looking for specific characters in the URL

oBDA
That worked great, the only question I have is why when I put the search string into a variable, why it doe not find it

So If I change your code to

$search = "Experts-Exchange"
"GFiYXNlaWQ9NTAwJmFtcDtzZXJpYWw9MTY4NTEwODQmYW1wO2Vt      Experts-Exchange               14.92" -match '$search\s+(?<Value>\d{1,3}\.\d{2})(\D|$)'

It does not find it

I'm not trying to base the search off the full content.  I want to know the context of the string you are showing us versus the entire (representative sample) URL.

Thanks for the help that worked perfectly