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.
|\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|
|?||Zero or one occurrences of the preceding character|
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