Encyclopedia > Wildcard character

  Article Content

Wildcard character

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 MS-DOS, Microsoft Windows and POSIX (Unix) shells. In SQL, the wildcard characters are percent (%) for zero or more characters, and underline (_) for one character. In many regular expression implementations, the period (.) is the wildcard character for a single character.

Source: originally from Federal Standard 1037C and from MIL-STD-188


See also wild card



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
The Star Beast

... an interstellar voyage, has a problem. The pet he inherited has grown to gargantuan proportions; it ate a used Buick and (still worse) destroyed a neighbor's flowers. ...