[FWP] subexpr nearest the 'middle' of expr

[Jacob Carpenter <jcarpenter@libronix.com>]

Let's see a subroutine that takes three (3) arguments [expr, subexpr,
replacement] -- call them whatever you like in the actual sub -- and returns
"expr" with the "subexpr" nearest the middle (currently, I intend 'middle'
to mean the byte position closest to half-the-byte-length of the string)
replaced with "replacement". Subexpr should be a literal string. and should
be centered on the middle, not begin in the middle -- i.e.
&replace_mid('aaaaa', 'aaa', 'BBB') is to return 'aBBBa' not 'aaBBB'.

In the case that the same subexpr is found 'just-left-of-center' and
'just-right-of-center,' you have discretion in which your sub favors -- i.e.
&replace_mid('aaaa', 'a', 'B') may return either 'aBaa' or 'aaBa'. I'd like
to see some for each way.

I'm certain this will clearly illustrate that TMTOWTDI, and I'm looking
forward to that. Ultimately, I have a feeling that this will result in a
golf match, but initially, I'm just interested in seeing interesting ways of
doing this.

Enjoy,
Jacob.

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