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| Option | Stands For | Description |
| g | Match Globally | Find all occurrences (not just the first instance). Primarily used for pattern filtering operations. |
| i | Ignore Case | Causes match for any combination of [a-z] or [A-Z] equally. |
| m | Multi-line | Treat string as multiple lines. |
| o | Once | Only compile pattern once. |
| s | Single-line | Treat string as a single line. |
| x | Extended | Enable the use of "extended" regular expressions. |