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.


 SQL

 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 0.0.0.0. To refer to all packets with Class A addresses in the 10.10.x.x range, the wildcard mask would be 0.0.255.255.

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 0.0.0.255 is the equivalent of a subnet mask of 255.255.255.0. See access control list, subnet mask and IP address. See also wild cards.
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References in periodicals archive ?
Gauff and McNally have said they plan to play doubles together at Flushing Meadows; that event's wild-card entries will be announced later.
The Philadelphia Eagles pulled off the biggest upset on Wild-Card Weekend when they beat the Chicago Bears at Soldier Field.
''I'm telling you, we're bringing that wild-card game back to the 216 and that place is going to be packed out and rockin', baby!'' Swisher said, citing Cleveland's area code.
They will host the Philadelphia Eagles in Sunday's NFC wild-card contest after the Eagles beat the Dallas Cowboys 44-6.
It leaves wild-card entries Katie O'Brien and Melanie South to carry home hopes in the south coast event.
Andersen said: "To be honest I wasn't expecting to get the wild-card for this weekend after what happened last year.
The wild-card winners - Harlequins are three points ahead of Leicester going into today's second semi-final at Welford Road - will clinch Heineken Cup qualification next season.
All four home teams are favored on Wild-Card Weekend, but it wouldn't at all be surprising to see a couple of road teams advance to the divisional round.
Summary: New Delhi [India], April 25 (ANI): The fourth edition of Rendezvous Roland Garros will kick start with the Junior Wild-Card Competition at the RK Khanna Tennis Stadium, which is slated to be held from today and will run till April 27.
Sixteen-year-old Alberto Lim Jr., Jeson Patrombon, 22, and Francis Casey Alcantara, 23, received wild-card spots in the main draw of the $75,000 ATP event strewn with regular tour campaigners just outside of the world's top 100.
The Blue Jays are assured of at least a wild-card berth and remained four games clear of the New York Yankees atop the AL East with eight to play.