REGEXP not properly handling \s*

The string

{"fooa": "2", "foob": "2","fooc":"1"}

is stored in a column named "test". The statement

select test from table1 WHERE test REGEXP '(\s*\"[^\"]+\"\s*\:\s*\"\s*2\s*\"\s*,?)';

does not match the string, and no result set is returned.

However, removing the FIRST blank space

{"fooa":"2", "foob": "2","fooc":"1"}

DOES allow the match to occur.

Checking against other PCRE-compliant engines (eg. Regex101.com) show that BOTH strings should match, yet for some reason, the MariaDB regex engine is getting tripped up on first space. If I'm missing something regarding notation, please do let me know.

Thanks