*** a/src/backend/tsearch/wparser_def.c
--- b/src/backend/tsearch/wparser_def.c
***************
*** 1121,1126 **** static const TParserStateActionItem actionTPS_InUnsignedInt[] = {
--- 1121,1129 ----
  	{p_iseqC, '.', A_PUSH, TPS_InUDecimalFirst, 0, NULL},
  	{p_iseqC, 'e', A_PUSH, TPS_InMantissaFirst, 0, NULL},
  	{p_iseqC, 'E', A_PUSH, TPS_InMantissaFirst, 0, NULL},
+ 	{p_iseqC, '-', A_PUSH, TPS_InHostFirstAN, 0, NULL},
+ 	{p_iseqC, '_', A_PUSH, TPS_InHostFirstAN, 0, NULL},
+ 	{p_iseqC, '@', A_PUSH, TPS_InEmail, 0, NULL},
  	{p_isasclet, 0, A_PUSH, TPS_InHost, 0, NULL},
  	{p_isalpha, 0, A_NEXT, TPS_InNumWord, 0, NULL},
  	{p_isspecial, 0, A_NEXT, TPS_InNumWord, 0, NULL},