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They have a slight similarity, however,
regexp are way more powerful. A wildcard
is ie an * and replaces any sequence of
characters. Regexps allow for differnt setups,
like explicitly searching for numeric components
Actually, the asterisk '*' symbol is just one of many used by various regex engines. It generally denotes zero or more chars at that position in the regex.
If you want to know more, try
man 7 regex
or http://regex.info , the wbsite devoted to Mastering Regular Expressions by Jeffrey Friedl, generally acknowledged to be the definitive book. There's a full searchable index link on the front page.