Wildcard Character

The term wildcard character has the following meanings:

TELECOMMUNICATION

In Telecommunication s, 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.

) 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 CP/M , DOS , Microsoft Windows and POSIX ( Unix ) shells. (In Unix 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 many Regular Expression implementations, the Period (.) is the wildcard character for a single character.

REFERENCES

Federal Standard 1037C and from MIL-STD-188

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	CATEGORIES ABOUT WILDCARD CHARACTER

	computer file formats

	pattern matching

Information About

Wildcard Character