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Perl regex to remove a segment in a line

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http://www.unix.com – Hello, ksh on Sun5.8 here. I have a pipe-delimited, variable length record file with sub-segments identified with a tilda that we receive from a source outside of our control. The records are huge, and Perl seems to be the only shell that can handle the huge lines. I am new to Perl, and am trying to come up with a regex to find segments > 15 and remove them. Some of these segments have sub-segments that should be ignored. i.e. ~DRG segments can have multiple ~DCT segments, and are followed by other segments, some of which are optional.. Here's a sample BEFORE: Code: |~DRG|15|qwe| (HowTos)