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Further, the "//" operator can be modified to include
complex pattern matching routines. For example, the
period (.) matching operator is used to stand for "any"
character. Thus, "/eri./" would match any occurrences of
"eric" as well as "erik".
Another commonly used matching operator is the
asterisk (*). The asterisk matches zero or more
occurrences of the character preceding it. Thus, "/e*ric/"
matches occurrences of "eeeeeric" as well as "eric".
The following table includes a list of
useful matching operators.
| Operator |
Description |
| \n |
New line |
| \r |
Carriage Return |
| \t |
Tab |
| \d |
Digit (same as [0-9]) |
| \D |
Any non-digit (same as [^0-9]) |
| \w |
A Word Character (same as [0-9a-zA-Z_]) |
| \W |
A Non-word character |
| \s |
Any white space character (\t, \n, \r, or \f) |
| \S |
A non-white space character |
| * |
Zero or more occurrences of the preceding character |
| + |
One or more occurrences of the preceding character |
| . |
Any character |
| ? |
Zero or one occurrences of the preceding character |
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