Regular expression syntax
A regular expression is a structured string that is used to match other strings. You can use regular expressions for data invalidation and for filtering the messages that display in the message center.
Regular expression examples
Regular expression | Description |
---|---|
. |
Finds any one character. |
.* |
Finds any one character zero or more times. |
A.* |
Finds all strings that start with "A". |
.*A |
Finds all strings that end with "A". |
A? |
Finds "A", zero or one time. |
A* |
Finds "A", zero or many times. |
A+ |
Finds "A", one time or many times. |
A?B*C+ |
Finds any one character, followed by zero or one A, followed by zero or many Bs, followed by one or many Cs |
[ABC].* |
Finds strings that start with the letters "A", or "B", or "C". |
.*ABC.* |
Finds strings with the string "ABC" somewhere in the string. |
(ABC|DEF).* |
Finds strings that start with the string "ABC" or "DEF". |