OK, I'll give it a try:

• If your file fits in memory and you want the rest of the line after the RE try:
  perl -i -e 'undef $/; ($dump, $keep)= split /RE/, <>; print $keep;' file
• Now if you want to keep lines AFTER the RE this should work... but it does not! Anybody can point my mistake?:
  perl -i -p -e '<> until( $ok || m/RE/); $ok=1 ' foo

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