zero-byte disturbs further regexp matching

[filimonov]

select unhex('34') || ' key="v" ' as haystack, length(haystack), extract( haystack, 'key="(.*?)"') as needle;
-- works, result = v

select unhex('00') || ' key="v" ' as haystack, length(haystack), extract( haystack, 'key="(.*?)"') as needle;
-- returns nothing (zero-byte in the begining of haystack)

select number as char_code,  extract( char(char_code) || ' key="v" ' as haystack, 'key="(.*?)"') as needle from numbers(256);
-- every other chars codes (except of zero byte) works ok

[alexey-milovidov]

It looks like the deficiency of re2 library. Upd: untrue.
It also does not support zero bytes in regexp.

[alexey-milovidov]

If use hyperscan instead of re2, everything is Ok:

select match('\0 key="v" ', 'key="(.*?)"')
0

select multiMatchAny('\0 key="v" ', ['key="(.*?)"'])
1