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Commit5bcb15b

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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 parente2e34df commit5bcb15b

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‎src/backend/regex/regc_lex.c

Lines changed: 10 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -750,7 +750,11 @@ lexescape(struct vars *v)
750750

751751
assert(!ATEOS());
752752
c=*v->now++;
753-
if (!iscalnum(c))
753+
754+
/* if it's not alphanumeric ASCII, treat it as a plain character */
755+
if (!('a' <=c&&c <='z')&&
756+
!('A' <=c&&c <='Z')&&
757+
!('0' <=c&&c <='9'))
754758
RETV(PLAIN,c);
755759

756760
NOTE(REG_UNONPOSIX);
@@ -892,8 +896,11 @@ lexescape(struct vars *v)
892896
RETV(PLAIN,c);
893897
break;
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default:
895-
assert(iscalpha(c));
896-
FAILW(REG_EESCAPE);/* unknown alphabetic escape */
899+
/*
900+
* Throw an error for unrecognized ASCII alpha escape sequences,
901+
* which reserves them for future use if needed.
902+
*/
903+
FAILW(REG_EESCAPE);
897904
break;
898905
}
899906
assert(NOTREACHED);

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