The following characters are reserved for regular expression control. They must be escaped; that is, prefixed with backslash (\) when they appear as part of a normal matching pattern (that is, not part of an expression), except where noted otherwise.
| Name | Symbol | Proper Syntax |
|---|---|---|
| backslash | \ | \\ |
| dot (period) | . | \. |
| pipe | | | \| |
| dash (hyphen) | - | \- |
| carat | ^ | \^ |
| dollar symbol | $ | \$ |
| open paren | ( | \( |
| close paren | ) | \) |
| open bracket | [ | \[ |
| close bracket | ] | \] |
| Pattern | Read as: |
|---|---|
| (text) | text |
| \(text) | \(text\) |
| www.trellix.com | www*trellix*com, where * is a single wildcard |
| www\.trellix\.com | www.trellix.com |