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Get text between two substrings

Given a string, what is a good do shell script one-liner to grab the text in between two sub-strings? In other words:

set theString to "<!-- Begin -->My very excellent mother just served us nine pies<!-- End -->"

set newString to do shell script "echo '" & theString & "' | perl something '<!-- Begin -->' something '<!-- End -->'"

-- My very excellent mother just served us nine pies


Would someone recommend a pure Applescript method (offset or TIDs)? I've been using this handler I made, but I think it's slow:

on trimContent(theString, theStart, theEnd)
-- if theStart or theEnd is an integer, then it trims at those characters, otherwise, it assumes each a string to be used as an offset
if (class of theStart) ≠ integer then
set theOffset to (offset of theStart in theString)
if theOffset = 0 then return 0
set theStart to (theOffset + (length of theStart))
end if

if (class of theEnd) ≠ integer then
set theOffset to (offset of theEnd in theString)
if theOffset = 0 then return 0
set theEnd to (theOffset - 1)
end if
set theString to text theStart thru theEnd of theString
end trimContent
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