# Regex in DRONE:

When performing keyword searches in DRONE, you can leverage regular expressions (POSIX regex) for more flexible and advanced search capabilities. Here’s how it works:

#### 1. **Regex Search Format**:

To use regex, your keyword must be enclosed between `/ /` slashes. For example:

* `/\d+/` – This will search for one or more digits.
* `/[a-z]+/i` – This will search for one or more lowercase letters and is **case-insensitive** (thanks to the `i` flag).

You can also include optional flags at the end of the regex to modify its behavior:

* **g**: Global (search all occurrences).
* **m**: Multiline (match across multiple lines).
* **i**: Case-insensitive (ignore letter case).
* **s**: Dot matches newline (dot `.` will match any character, including newlines).

**Example**:\
`/[A-Z]+\d+/i` – This will match sequences like "ABC123" or "abc123" regardless of case.

#### 2. **Wildcard Search**:

If your search contains wildcard patterns like `*?` (indicating lazy quantifiers), it will be treated as a **wildcard search** instead of a regex search.

* For example, `abc*?` will match "abc", "abcd", "abcxyz", etc.

#### 3. **String Contains Search**:

If your input doesn’t match the regex format and doesn’t contain wildcard symbols, DRONE will perform a **case-insensitive "string contains" search**.

* For example, searching for `example` will return results containing "example", "Example", or "EXAMPLE".