How to use Regular Expression to find SSN and then replace

i found regular expression in pattern think need social security number.

(?!000)(?!666)^([0-8]\d{2})(\d{2})(\d{4})$

my files not have spaces within numbers or hyphens.

i want find ssn in all. txt document in specific folder , replace them x except last 4 digits on right.  nice tell user how many found , replaced.  (that might bit ask know.)

my folder path here \\shared\e_drive\process\scrub.

can point me in right direction 1)excecute expression , find social sec numbers 2)replace matches xxxx except last 4 numbers. 3) message of completion.   help.

i found couple similar examples via google not same.

here replacement within line:

'this line 23-456-1234 , end' -replace '\d{2}-\d{3}-(\d{4})' ,'xx-xxx-$1'

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