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#!/usr/bin/perl

...
while(<FH>) {
  print "$_\n" if ( $_ =~ /$reg_ex/s );
}

$ perl t.pl
2005/11/18 00:06:49:875: FIXPump: Received data on connection {OBMSCNX
+} [8=FIX.4.29=040435=849=EXLINK256=DB_ORDER50=DESRISKGATEWAY57=DCN323
+0134=4045052=20051118-05:06:491=ATOP116=0.0000000011=DES:fud630_20051
+11814=15.000017=0131730433520=031=138.0800000032=15.000037=1317260622
+38=15.000039=254=155=ContractNum60=20051118-05:06:49150=2151=0.000019
+8=13173047101317260622109=DCN3230163=0167=FUT200=200512207=TSE40=244=
+138.080000005113=06556=20051117-23:06:4610=230]