A regular term describes a certain quantity of character strings. These terms are determined with syntactic rules.
| Character | Description |
| x | The letter „x“ |
| [abc] | a, b, or c |
| [^abc] | Each character except a, b, or c |
| [a-z] | Each small letter |
| . | An arbitrary character |
| ? | The previous term must appear only once or not at all {0,1} |
| + | The previous term can appear once or as often as requiered {1,∞} |
| * | The previous term can appear as often as requiered but does not have to appear at all {0,∞} |
| Repeals the meaning of the following character (e.g. „.“ stands for „.“) |
Examples:
| Regular Term |
Description |
| .*\.csv | All character strings, that end with „.csv“ |
| [a-zA-Z0-9]*\.xls | Any number of letters and numerical digits, and ending with „.xls“ |
| Sensor.* | All character strings, that begin with Sensor and end at will (Sensor1, SensorX, SensorSynavision) |
| file.\.txt | All character strings, that begin with file, have any additional character and end with „.txt“ (Datei1.txt, DateiP.txt) |
| A[0-9]*\.csv | All character strings, that begin with „A“, have any number of additional numerical digits and end with „.csv“ (A0192.csv, A.csv, A4.csv) |