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perl -wle '$_="|<br />|"; s{<br />}{\par}ig; print' Unrecognized escape \p passed through at -e line 1. |par|
perl5.10.0 -wle '$_="!<br />!"; s{<br />}{\\par}ig; print'|hexdump -C 00000000 21 5c 70 61 72 21 0a |!\par!.| 00000007