(I'm not a subscriber of DFSORT.  I'll pst here and
hope it percolates.  I'll submit this as a Feedback)

In:  SC23-6878-60 DFSORT Application Programming Guide
<https://www.ibm.com/docs/en/SSLTBW_3.1.0/pdf/icea100_v3r1.pdf>

• Regular expression characters require code page
 (CCSID) IBM-1047. See Table 109 on page 833.
But the table cited shows nog 1047 but 037.
Accuracy matters.  Not all RE control characters
appear in that table.

Two versions of regular expressions are supported:
• Basic regular expressions (BRE)
• Extended regular expressions (ERE)
It fails to specify which is supported:
• (BRE)?
• (ERE)?
• Programmer's option (selected how?)

-- 
Thanks,
gil

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