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Commitdde926b

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Avoid character classification in regex escape parsing.
For regex escape sequences, just test directly for the relevant ASCIIcharacters rather than using locale-sensitive characterclassification.This fixes an assertion failure when a locale considers a non-ASCIIcharacter, such as "൧", to be a digit.Reported-by: Richard GuoDiscussion:https://postgr.es/m/CAMbWs49Q6UoKGeT8pBkMtJGJd+16CBFZaaWUk9Du+2ERE5g_YA@mail.gmail.comBackpatch-through: 11
1 parent6d60b71 commitdde926b

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‎src/backend/regex/regc_lex.c

Lines changed: 10 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -616,7 +616,11 @@ lexescape(struct vars *v)
616616

617617
assert(!ATEOS());
618618
c=*v->now++;
619-
if (!iscalnum(c))
619+
620+
/* if it's not alphanumeric ASCII, treat it as a plain character */
621+
if (!('a' <=c&&c <='z')&&
622+
!('A' <=c&&c <='Z')&&
623+
!('0' <=c&&c <='9'))
620624
RETV(PLAIN,c);
621625

622626
NOTE(REG_UNONPOSIX);
@@ -758,8 +762,11 @@ lexescape(struct vars *v)
758762
RETV(PLAIN,c);
759763
break;
760764
default:
761-
assert(iscalpha(c));
762-
FAILW(REG_EESCAPE);/* unknown alphabetic escape */
765+
/*
766+
* Throw an error for unrecognized ASCII alpha escape sequences,
767+
* which reserves them for future use if needed.
768+
*/
769+
FAILW(REG_EESCAPE);
763770
break;
764771
}
765772
assert(NOTREACHED);

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