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Commitc04c6c5

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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 parenta23ab2e commitc04c6c5

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‎src/backend/regex/regc_lex.c

Lines changed: 10 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -613,7 +613,11 @@ lexescape(struct vars *v)
613613

614614
assert(!ATEOS());
615615
c=*v->now++;
616-
if (!iscalnum(c))
616+
617+
/* if it's not alphanumeric ASCII, treat it as a plain character */
618+
if (!('a' <=c&&c <='z')&&
619+
!('A' <=c&&c <='Z')&&
620+
!('0' <=c&&c <='9'))
617621
RETV(PLAIN,c);
618622

619623
NOTE(REG_UNONPOSIX);
@@ -755,8 +759,11 @@ lexescape(struct vars *v)
755759
RETV(PLAIN,c);
756760
break;
757761
default:
758-
assert(iscalpha(c));
759-
FAILW(REG_EESCAPE);/* unknown alphabetic escape */
762+
/*
763+
* Throw an error for unrecognized ASCII alpha escape sequences,
764+
* which reserves them for future use if needed.
765+
*/
766+
FAILW(REG_EESCAPE);
760767
break;
761768
}
762769
assert(NOTREACHED);

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