wild card

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wild card

1. See wild (sense 4)
2. Computing a symbol that can represent any character or group of characters, as in a filename
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

wild card

[′wīld ‚kärd]
(computer science)
A symbolic character in a search argument such that any character will satisfy it.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

wild card

(operating system, programming, text)
(From card games in which certain cards, often the joker, can act as any other card) A special character or character sequence which matches any character in a string comparison, like ellipsis ("...") in ordinary written text.

In Unix filenames '?' matches any single character and '*' matches any zero or more characters. In regular expressions, '.' matches any one character and "[...]" matches any one of the enclosed characters.

See also Backus-Naur Form.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

wild cards

Symbols used to represent any value when selecting specific files. In DOS, Windows and Unix, the asterisk (*) represents any collection of characters, and the question mark (?) represents a single character. In SQL, the percent sign (%) and underscore (_) are used for matching text. Note the following examples:

DOS and Windows (case insensitive)

 *.gif    .gif or .GIF extension

 a*.gif   beginning with "a" or "A"

 boot.*   all files named "BooT"
           any mix upper/lower case

 *.d*     extensions starting with
           "d" or "D"

 ?abc     1ABC, 2abc, etc.

 ??abc    10ABC, xxabc, etc.

 Windows only (case insensitive)

 *t.jpg   JPEG files ending with "T"

 Unix only (case sensitive)

 *.jpg    .jpg extension

 *.JPG    .JPG extension

 a*.jpg   beginning with "a"

 A*.jpg   beginning with "A"

 boot.*   all files named "boot"

 BOOT.*   all files named "BOOT"

 ?abc     1abc, xabc, etc.

 ??ABC    10ABC, XXABC, etc.


 Good%    begining with "Good"

 _bcd     any name followed by "bcd"

wildcard mask

A coding system used with access control lists to identify IP addresses. A line entry in the list contains a command, an IP address and a mask that references the IP address. Although access list commands are cryptic, an English translation of a line entry might be "deny entry to packets with these addresses."

The mask is a binary pattern that contains the same number of bits as the IP address. Each 0 bit in the mask means that the corresponding bit in the IP address must match exactly. A 1 indicates that the bit does not have to match and can be ignored. For example, in order to stipulate a specific IP address, that address would be accompanied by a wildcard mask of To refer to all packets with Class A addresses in the 10.10.x.x range, the wildcard mask would be

The Opposite of the Subnet Mask
Whereas a 0 bit in a wildcard mask means "match the bits," a 0 in a subnet mask means "do not match." Thus, a wildcard mask of is the equivalent of a subnet mask of See access control list, subnet mask and IP address. See also wild cards.
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References in periodicals archive ?
Age restrictions set up by the women's professional tour limit the number of tournaments someone who is 15 can enter and the number of wild-card invitations she can be offered -- and Gauff already has accepted three wild cards elsewhere.
Bains will play at the All England Club, though, having been given a doubles wild card alongside Naomi Broady.
The Roland-Garros Junior Wild Card Series aims at providing a clay court tennis experience to the young talent of India, and at promoting the same at the grassroots level.
Of course, there are those events where wild cards will not even count as long as the coaches are satisfied with the top four.
The wild cards for this month's event have gone to 51-year-old Darren Morgan and Welsh amateur champion Rhydian Richards.
Dubai: Sixteen of the world's biggest hitters including three UAE wild cards will take part in the Long Drive World Series when it returns to Dubai's Jumeirah Golf Estates on February 9.
The French Tennis Federation this week decided against offering her a wild card either to the main draw or to qualifying.
The FTF president said on Facebook: "I just wanted to tell you that I decided not to give to Maria Sharapova a wild card, a wild card she asked me for.
Andy Murray and Heather Watson, who herself will need a wild card into the tournament, have publicly express the view that doping offenders should not be given a helping hand on their return.
Central as of this writing, the Indians figure to do no worse than a wild card spot.
It has been confirmed that our two swimmers - one male and one female, will be representing the country at Rio under wild card system, while participation of those of athletics and boxing athletes will be confirmed within a couple of weeks, Secretary POA Khalid Mehmood told reporter on Thursday.