Error parsing messages

[airween]

Hi,

I ran into a problem with two regular expressions:

$ bin/regexploit
Welcome to Regexploit. Enter your regexes:
(?i)(?:(?:(?:(?:trunc|cre|upd)at|renam)e|d(?:e(?:lete|sc)|rop)|(?:inser|selec)t|alter|load)\s*?\(\s*?space\s*?\(|,.*?[)\da-f\"'`][\"'`](?:[\"'`].*?[\"'`]|(?:\r?\n)?\z|[^\"'`]+)|\Wselect.+\W*?from)(regexp)
Error parsing: (?i)(?:(?:(?:(?:trunc|cre|upd)at|renam)e|d(?:e(?:lete|sc)|rop)|(?:inser|selec)t|alter|load)\s*?\(\s*?space\s*?\(|,.*?[)\da-f\"'`][\"'`](?:[\"'`].*?[\"'`]|(?:\r?\n)?\z|[^\"'`]+)|\Wselect.+\W*?from)(regexp) bad escape \z at position 164
No ReDoS found.

$ bin/regexploit
Welcome to Regexploit. Enter your regexes:
(?i)(?:[\"'`]\s*?(?:(?:n(?:and|ot)|(?:x?x)?or|between|\|\||and|div|&&)\s+[\s\w]+=\s*?\w+\s*?having\s+|like(?:\s+[\s\w]+=\s*?\w+\s*?having\s+|\W*?[\"'`\d])|[^?\w\s=.,;)(]++\s*?[(@\"'`]*?\s*?\w+\W+\w|\*\s*?\w+\W+[\"'`])|(?:union\s*?(?:distinct|[(!@]*?|all)?\s*?[([]*?\s*?select|select\s+?[\[\]()\s\w\.,\"'`-]+from)\s+|\w\s+like\s+[\"'`]|find_in_set\s*?\(|like\s*?[\"'`]%)(regexp)
Error parsing: (?i)(?:[\"'`]\s*?(?:(?:n(?:and|ot)|(?:x?x)?or|between|\|\||and|div|&&)\s+[\s\w]+=\s*?\w+\s*?having\s+|like(?:\s+[\s\w]+=\s*?\w+\s*?having\s+|\W*?[\"'`\d])|[^?\w\s=.,;)(]++\s*?[(@\"'`]*?\s*?\w+\W+\w|\*\s*?\w+\W+[\"'`])|(?:union\s*?(?:distinct|[(!@]*?|all)?\s*?[([]*?\s*?select|select\s+?[\[\]()\s\w\.,\"'`-]+from)\s+|\w\s+like\s+[\"'`]|find_in_set\s*?\(|like\s*?[\"'`]%)(regexp) multiple repeat at position 170
No ReDoS found.

Both of them gives Error parsing results - but No ReDoS found.

These expressions are working with PCRE as well.

I tried to explain this behavior in documentation, but didn't find any information about "Error parsing" results.

What does it mean? How reliable the result ("No ReDoS found") after this?

Thanks.