$ perl clms_regex.pl 
Compiling REx "[\s200c]+A"
Final program:
   1: PLUS (13)
   2:   ANYOF[\x{09}-\x{0D} 02c][{utf8}0085 00A0 1680 2000-200A 2028-2029 202F 205F 3000] (0)
  13: EXACT <A> (15)
  15: END (0)
floating "A" at 1..9223372036854775807 (checking floating) stclass ANYOF[\x{09}-\x{0D} 02c][{utf8}0085 00A0 1680 2000-200A 2028-2029 202F 205F 3000] plus minlen 2 
Matching REx "[\s200c]+A" against "X %t %t %t %t %t %t %t %t %t %t %t %t %t %t %t %t %t %t %t "...
Intuit: trying to determine minimum start position...
  Did not find floating substr "A"...
Match rejected by optimizer
Freeing REx: "[\s200c]+A"