I’m going crazy…

I’m tailing file and, if a string match my pattern, I want to output the match in a text file.

Everything works but, the output is truncated…

What am I doing wrong?

$MyMatch = "(A.{21})(.*?)(CALLID:(.*?)@10)"

demo

or

$MyMatch = "(A.{0,21})(.*?)(CALLID:(.*?)@10)"

or

$MyMatch = "(^.{0,21})(.*?)(CALLID:(.*?)@10)"

or

$MyMatch = "(^[sS]{0,21})(.*?)(CALLID:(.*?)@10)"

if I test regex on a shell works, if i run the script:

Get-Content "$file" -Tail 1 -Wait | foreach {
    if ( $_ -match "REINVITE" ) {
        $MSG = [regex]::match($_, $CALLID).Groups[1,4].Value 
        $MSG | Out-File "$OutFile"
    }
}

This is the content of $OutFile:

This is the last line in $File:

24-07-09 05:19:18,938 I [PipelineThread-6          CallStateConnected               72] [SIGNAL  ] CALLID:8805F91D-3CE44444444444444444444711EF-972CB613-C78A0EFF@10.49.86.173 - INVITE request received. REINVITE

Why the first 2 chars are skipped?