Matching REx "\G\d+R" against "QQQQQQQQQQ"
Intuit: trying to determine minimum start position...
  Did not find floating substr "R"...
Match rejected by optimizer
Matching REx "\w" against "QQQQQQQQQQ"
Matching stclass POSIXD[\w] against "QQQQQQQQQQ" (10 bytes)
   0 <> <QQQQQQQQQQ>         |  1:POSIXD[\w](2)
   1 <Q> <QQQQQQQQQ>         |  2:END(0)
Match successful!
...
Matching REx "\G\d+R" against "QQQQQQQQQQ"
Regex match can't succeed, so not even tried
Matching REx "\w" against "Q"
Matching stclass POSIXD[\w] against "Q" (1 bytes)
   9 <QQQQQQQQQ> <Q>         |  1:POSIXD[\w](2)
  10 <QQQQQQQQQQ> <>         |  2:END(0)
Match successful!
Matching REx "\G\d+R" against "QQQQQQQQQQ"
Regex match can't succeed, so not even tried
Matching REx "\w" against ""
Regex match can't succeed, so not even tried
----------------------------------------------------
--------------------------------------------------------------------------------

Matching REx "\G\d+R" against "RRRRRRRRRR"
Intuit: trying to determine minimum start position...
  Found floating substr "R" at offset 1...
  (multiline anchor test skipped)
  looking for class: start_shift: 1 check_at: 1 rx_origin: 0 endpos: 1
  This position contradicts STCLASS...
Match rejected by optimizer
Matching REx "\w" against "RRRRRRRRRR"
Matching stclass POSIXD[\w] against "RRRRRRRRRR" (10 bytes)
   0 <> <RRRRRRRRRR>         |  1:POSIXD[\w](2)
   1 <R> <RRRRRRRRR>         |  2:END(0)
Match successful!
Matching REx "\G\d+R" against "RRRRRRRRRR"
Intuit: trying to determine minimum start position...
  Found floating substr "R" at offset 1...
  (multiline anchor test skipped)
  looking for class: start_shift: 1 check_at: 2 rx_origin: 1 endpos: 2
  This position contradicts STCLASS...
Match rejected by optimizer
Matching REx "\w" against "RRRRRRRRR"
Matching stclass POSIXD[\w] against "RRRRRRRRR" (9 bytes)
   1 <R> <RRRRRRRRR>         |  1:POSIXD[\w](2)
   2 <RR> <RRRRRRRR>         |  2:END(0)
Match successful!
...