Register PostgreSQL-compatible regular expression functions
(conn: &Connection)
| 4 | |
| 5 | /// Register PostgreSQL-compatible regular expression functions |
| 6 | pub fn register_regex_functions(conn: &Connection) -> Result<()> { |
| 7 | debug!("Registering regex functions"); |
| 8 | |
| 9 | // Register case-sensitive REGEXP function |
| 10 | conn.create_scalar_function( |
| 11 | "regexp", |
| 12 | 2, |
| 13 | FunctionFlags::SQLITE_UTF8 | FunctionFlags::SQLITE_DETERMINISTIC, |
| 14 | |ctx| { |
| 15 | let pattern: String = ctx.get(0)?; |
| 16 | let text: String = ctx.get(1)?; |
| 17 | |
| 18 | trace!("regexp('{}', '{}')", pattern, text); |
| 19 | |
| 20 | match Regex::new(&pattern) { |
| 21 | Ok(re) => Ok(re.is_match(&text)), |
| 22 | Err(e) => { |
| 23 | debug!("Invalid regex pattern '{}': {}", pattern, e); |
| 24 | // PostgreSQL returns NULL for invalid patterns |
| 25 | Ok(false) |
| 26 | } |
| 27 | } |
| 28 | }, |
| 29 | )?; |
| 30 | |
| 31 | // Register case-insensitive REGEXPI function |
| 32 | conn.create_scalar_function( |
| 33 | "regexpi", |
| 34 | 2, |
| 35 | FunctionFlags::SQLITE_UTF8 | FunctionFlags::SQLITE_DETERMINISTIC, |
| 36 | |ctx| { |
| 37 | let pattern: String = ctx.get(0)?; |
| 38 | let text: String = ctx.get(1)?; |
| 39 | |
| 40 | trace!("regexpi('{}', '{}')", pattern, text); |
| 41 | |
| 42 | // Add (?i) flag for case-insensitive matching |
| 43 | let case_insensitive_pattern = format!("(?i){pattern}"); |
| 44 | |
| 45 | match Regex::new(&case_insensitive_pattern) { |
| 46 | Ok(re) => Ok(re.is_match(&text)), |
| 47 | Err(e) => { |
| 48 | debug!("Invalid regex pattern '{}': {}", case_insensitive_pattern, e); |
| 49 | // PostgreSQL returns NULL for invalid patterns |
| 50 | Ok(false) |
| 51 | } |
| 52 | } |
| 53 | }, |
| 54 | )?; |
| 55 | |
| 56 | // Also register the standard SQLite REGEXP operator handler |
| 57 | // This enables "text REGEXP pattern" syntax in SQLite |
| 58 | conn.create_scalar_function( |
| 59 | "regexp", |
| 60 | 2, |
| 61 | FunctionFlags::SQLITE_UTF8 | FunctionFlags::SQLITE_DETERMINISTIC, |
| 62 | |ctx| { |
| 63 | // Note: SQLite calls this with (pattern, text) order |