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Special character | Function |
|---|---|
. | This will match any single character other than a newline |
* | This matches zero or more consecutive characters. For example (/ba*) will match “ba” and “baaa” as the expression will match more than one “a” characters. |
\ | Escape following special character. This will allow special characters to be matched within the email. For example if you are looking for “[abc]” the regex will have to be \[abc\] as this will mean that the regex will also look for “[ ]” as a character. |
( ) | Used to define a capture group within a regex. |
[ ] | This is used to define which Character sets you want to capture. For example ([a-z]) will capture all characters that are a lower case alphabetical character. |
{ } | Indicates how many characters the value must have. This can be an exact number or between a certain range. |
+ | Matches one or more consecutive characters. |
| | Matches either what is before or after the | allowing for a or condition |
In regards to the expression .*
The expression is a wildcard it’s usage should be restricted and only when completely necessary. This expression it will match everything. If used incorrectly this can cause long processing times as the expression will try to evaluate a possibly long input which can significantly delay processing in JEMH Data Center. Or in the case in JEMHC timeout processing.