SIMILAR TO with quantifier {n,} in the pattern: 1) fails on 2.5 ("Invalid
pattern"), 2) strange result in 3.0
--------------------------------------------------------------------------------------------------------------
Key: CORE-4740
URL: http://tracker.firebirdsql.org/browse/CORE-4740
Project: Firebird Core
Issue Type: Bug
Reporter: Pavel Zotov
case-1: select iif( 'abcZ' similar to '[[:lower:]]{1,}Z', 1, 0) result from
rdb$database; -- NB: letter 'Z' - in upper case
case-2: select iif( 'abcz' similar to '[[:lower:]]{1,}z', 1, 0) result from
rdb$database; -- NB: letter 'Z' - in lower case, as all preceding ones
Result in WI-V2.5.4.26857 for both cases:
===
Statement failed, SQLSTATE = 42000
Invalid SIMILAR TO pattern
===
Result in WI-T3.0.0.31780:
SQL> select iif( 'abcZ' similar to '[[:lower:]]{1,}Z', 1, 0) result from
rdb$database;
RESULT
============
1
SQL> select iif( 'abcz' similar to '[[:lower:]]{1,}z', 1, 0) result from
rdb$database;
RESULT
============
0
Why second matching fails if we have three letters in lowercase left side from
'z' ?
If SIMILAR-engine count characters upto final one ('z') when it encounteres
{1,} than why it does NOT so in the following cases (and these are also seems
"invalid" for 2.5 as above):
SQL> select iif( 'abcz' similar to '[[:lower:]]*z', 1, 0) result from
rdb$database;
RESULT
============
1
SQL> select iif( 'abcz' similar to '[[:lower:]]+z', 1, 0) result from
rdb$database;
RESULT
============
1
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