^test$	Exact message "test" only
\btest\b	"test" as a word anywhere ("run a test" matches)
test	"test" anywhere, even inside "testing"

^hello	Message starts with "hello"
bye$	Message ends with "bye"
\b	Word boundary (space, punctuation, start/end)

^(test|check)$	Exact match "test" OR "check"
foo|bar	"foo" or "bar" anywhere in message
(hello|hi)\s+there	"hello there" or "hi there"

.	Any single character
.*	Zero or more of anything
.+	One or more of anything
\d+	One or more digits (0-9)
\w+	One or more word characters (a-z, 0-9, _)
\s	Whitespace (space, tab)
[aeiou]	Any one of these characters
colou?r	? = optional char ("color" or "colour")

^test$	Only "test" (recommended for single-word triggers)
^(cq|hello)\b	Messages starting with "cq" or "hello"
\bhelp\b.*\bfreq	"help" followed by "freq" somewhere after
^\d+$	Message that is only a number

test	Matches "test", "Test", "TEST" (default: case-insensitive)
(?-i:test)	Case-sensitive: only lowercase "test"
(?-i:CQ)	Case-sensitive: only uppercase "CQ"