Wildcard character

Wildcard character

: "For other meanings of 'wild card' see wild card."The term wildcard character has the following meanings:

Telecommunication

In telecommunications, a wildcard character is a
character that may be substituted for any of a defined subset of all possible characters.

* In high-frequency (HF) radio automatic link establishment, the wildcard character "?" may be substituted for any one of the 36 characters, "A" through "Z" and "0" through "9."
* Whether the wildcard character represents a single character or a string of characters must be specified.

Computing

In computer (software) technology, a wildcard character can be used to substitute for any other character or characters in a string. The asterisk (*) usually substitutes as a wildcard character for any zero or more characters, and the question mark (?) usually substitutes as a wildcard character for any one character, as in the command line interpreters of CP/M, DOS, Microsoft Windows and Unix-like operating systems. This is referred to as glob expansion.In SQL, wildcard characters can be used in "LIKE" expressions; the percent sign (%) matches zero or more characters, and underscore (_) a single character. In Microsoft Access, wildcard characters can be used in "LIKE" expressions; the asterisk sign (*) matches zero or more characters, and question mark (?) a single character. In many regular expression implementations, the period (.) is the wildcard character for a single character.

References

* Federal Standard 1037C and from MIL-STD-188

ee also

* glob (programming)
* Wildcard DNS record
* wildmat

External links

* [http://www.linfo.org/wildcard.html How to Use Wildcards]
* [http://shwild.org/ shwild: Shell-compatible wildcards (C/C++)]


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