^                 # begins at start of body
s*               # possible spaces
(
hii?(?![a-z])|    # any of these greeting words
hello|
h(e|a)y(?![a-z])|
dear|
greetings|
hai|
guys|
howdy|
h(i|e)ya|
hola
)
.*?               # followed by anything, up to...
(
[.,;!-]+          # one or more bits of punctuation
s*               # possible spaces
|
(r?n)+          # one or more newlines
)

s*
(
(ands*)?(+s*)?(withs*)?
(sos*)?(manys*)?(mu?chs*)?
(lotss*(ofs*)?)?
((tha?nk)|(thx)|(thnx)|regard)s?s*
(yous*)?
(in adva?nced?s*)?
((as*)?lots?s*)?
(((verys*)|(sos*))?mu?chs*)?
((ands*)?(+s)?regards?s*)?
[.!]*s*
([:;]s*[-~=]*s*[)]}>D3]+)* #smilies :) :D ;-3 etc.
[.!]*s*
)
$