# name: test/sql/function/string/regex_escape.test
# description: regex escape test
# group: [string]

statement ok
PRAGMA enable_verification

# test the example
query T
SELECT regexp_escape('https://duckdb.org');
----
https\:\/\/duckdb\.org

# no special chars
query T
SELECT regexp_escape('abc123ABC');
----
abc123ABC

# metacharacters
query T
SELECT regexp_escape('a.b[c]*');
----
a\.b\[c\]\*

# whitespaces
query T
SELECT regexp_escape('a b c');
----
a\ b\ c

# new line character
query T
SELECT regexp_escape('\n');
----
\\n

query T
SELECT regexp_escape('line1\nline2');
----
line1\\nline2

# unicode character
query T
SELECT regexp_escape('@');
----
\@

# backslashes
query T
SELECT regexp_escape('path\to\wonderland');
----
path\\to\\wonderland

# more special characters
query T
SELECT regexp_escape('$()*+.?[\]^{|}-');
----
\$\(\)\*\+\.\?\[\\\]\^\{\|\}\-

# mode output_hash

# test a table of 1000 strings with special characters
statement ok
CREATE TABLE tbl (c VARCHAR(255));

statement ok
INSERT INTO tbl SELECT 'a)*.?[\]b^{2.+_c' FROM generate_series(1, 500);

statement ok
INSERT INTO tbl(c) SELECT '1?ch@racter$' FROM generate_series(1, 500);

query I
SELECT regexp_escape(c) FROM tbl;
----
1000 values hashing to d9c29c89fadac59fb2be2397a94af1ee

query I
WITH cte AS (
    SELECT c
    FROM tbl
    LIMIT 500
)
SELECT sum(cast(regexp_escape(c) = 'a\)\*\.\?\[\\\]b\^\{2\.\+_c' as int))
FROM cte
----
500

query I
WITH cte AS (
    SELECT c
    FROM tbl
    OFFSET 500 LIMIT 500
)
SELECT sum(cast(regexp_escape(c) = '1\?ch\@racter\$' as int))
FROM cte
----
500