Regular expression options that let you specify how a regular expression pattern will be interpreted.
| Regular Expression | Description |
|---|---|
| (?i) | Enables case-insensitive matching. For example, (?i)[A-Z] would match any upper-case or lower-case letter. |
| (?m) | Enables multi-line mode. ^ and $ will match the beginning and end of a line, instead of the beginning and end of the text. |
| (?n) | Enables capturing named groups only. (I.e., groups using this format: (?<name> subexpression).) |
| (?s) | Enables single-line mode. ^ and $ will match the beginning and end of the text, instead of the beginning and end of a line. |
| (?x) | Enables ignoring white space in the regular expression. |
| (?-i) | Disables case-insensitive matching. For example, (?!)[A-Z](?-i)[A-Z] would match any upper-case or lower-case letter that was followed by an upper-case letter. |
| (?-m) | Disables multi-line mode. ^ and $ will match at the beginning and end of the text, |
| (?-n) | Disables capturing named groups only. |
| (?-s) | Disables single-line mode. |
| (?-x) | Disables ignoring white space in the regular expression. |