Fetch value between 2 characters from a string

I am getting below string as output

RX Power:    -3.4    dBm (460.9uW)

I tried below code but I am getting output like

:    -3.4    d

I want output

-3.4

$pattern = '(?s)\:.*? d+'
[regex]::Matches($RXTX_Data[0], $pattern).Value

Please let me know what is missing here

>Solution :

Try \s(-?\d+.?\d+)\s for your pattern.

• \s for whitespace character on either side of number
• -? for checking if ‘-‘ is in number group
• .? for checking if ‘.’ is in number group
• \d+ for matching 1 or more numbers in number group
• () for specifying the group you wish to capture i.e. the number group

It worked for me on https://regex101.com. If you haven’t heard of it, it’s a good place to practice regex.