I was surprised that it would not bail out at the full-stops.
The full stop is the concatenation operator. This is valid perl:
$ perl -ce 'a . b;'
-e syntax OK
If your only punctuation is the full stop and the comma you can get away with most things. Just avoid reserved words near punctuation.
$ perl -ce 'Twas brillig, and the slithy toves Did gyre and gimble in
+the wabe; All mimsy were the borogoves, And the mome raths outgrabe'
-e syntax OK
Of course, you couldn't end that with a full stop because it's a binary operator. HTH
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