A. Regular expression syntax
This is not currently part of the peer-reviewed material of the project. Do not cite as a research publication.
Use the following codes in regular expression searches.
| ^ | match the beginning of a field |
| $ | match the end of a field |
| . | match any character |
| \. | match a full-stop |
| a* | match any sequence of zero or more a characters |
| a+ | match any sequence of one or more a characters |
| a? | match either zero or one a character |
| de|abc | match either of the sequences de or abc |
| match |