Information about Wildmat
wildmat is a pattern matching library developed by Rich Salz. Based on the wildcard syntax already used in the Bourne shell, wildmat provides a uniform mechanism for matching patterns across applications with simpler syntax than that typically offered by regular expressions. Patterns are implicitly anchored at the beginning and end of each string when testing for a match.
There are five pattern matching operations other than a strict one-to-one match between the pattern and the source to be checked for a match.
The full wildmat syntax is unable to handle multi-octet character sets, and poses problems when the text being searched may contain multiple incompatible character sets. A simplified version of wildmat oriented toward UTF-8 encoding has been developed by the IETF NNTP working group, to be included in an upcoming standards document.
In logic and mathematics, negation or not is an operation on logical values, for example, the logical value of a proposition, that sends true to false and false to true.
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There are five pattern matching operations other than a strict one-to-one match between the pattern and the source to be checked for a match.
- The first is an asterisk (*) to match any sequence of zero or more characters.
- The second is a question mark (?) to match any single character.
- The third specifies a specific set of characters. The set is specified as a list of characters, or as a range of characters where the beginning and end of the range are separated by a minus (or dash) character, or as any combination of lists and ranges. The dash can also be included in the set as a character if it is the beginning or end of the set. This set is enclosed in square brackets. The close square bracket (]) may be used in a set if it is the first character in the set.
- The fourth operation is the same as the logical not of the third operation and is specified the same way as the third with the addition of a caret character (^) at the beginning of the test string just inside the open square bracket.
- The final operation uses the backslash character to invalidate the special meaning of the open square bracket ([), the asterisk, backslash or the question mark. Two backslashes in sequence will result in the evaluation of the backslash as a character with no special meaning.
The full wildmat syntax is unable to handle multi-octet character sets, and poses problems when the text being searched may contain multiple incompatible character sets. A simplified version of wildmat oriented toward UTF-8 encoding has been developed by the IETF NNTP working group, to be included in an upcoming standards document.
External link
- comp.sources.misc article from Rich Salz containing the wildmat source code
Rich Salz is currently Chief Security Officer of Datapower , which was recently acquired by IBM.
He has made numerous contributions to recent work on XML and SOAP specifications, particularly involving security.
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He has made numerous contributions to recent work on XML and SOAP specifications, particularly involving security.
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The Bourne shell, or sh, was the default Unix shell of Unix Version 7, and replaced the Thompson shell, whose executable file had the same name, sh. It was developed by Stephen Bourne, of AT&T Bell Laboratories, and was released in 1977 in the Version 7 Unix release
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In computing, a regular expression is a string that is used to describe or match a set of strings, according to certain syntax rules.
Regular expressions are used by many text editors, utilities, and programming languages to search and manipulate text based on patterns.
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Regular expressions are used by many text editors, utilities, and programming languages to search and manipulate text based on patterns.
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For other uses, see .
In logic and mathematics, negation or not is an operation on logical values, for example, the logical value of a proposition, that sends true to false and false to true.
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The Network News Transfer Protocol or NNTP is an Internet application protocol used primarily for reading and posting Usenet articles (aka netnews), as well as transferring news among news servers.
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InterNetNews (INN) is a Usenet news server package, originally released by Rich Salz in 1991 and presented at the Summer 1992 USENIX conference in San Antonio, Texas. It was the first news server with integrated NNTP functionality.
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GNU (pronounced ) is a computer operating system composed entirely of free software.
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In computing, an octet is a grouping of eight bits.
In France, French Canada and Romania, the word octet usually means byte; a megabyte (MB) is called a megaoctet in France, Romania and also French Canada. Bit and Byte are homophones in the French language.
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In France, French Canada and Romania, the word octet usually means byte; a megabyte (MB) is called a megaoctet in France, Romania and also French Canada. Bit and Byte are homophones in the French language.
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UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is able to represent any character in the Unicode standard, yet the initial encoding of byte codes and character assignments for UTF-8 is backwards compatible with ASCII.
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Internet Engineering Task Force (IETF) develops and promotes Internet standards, cooperating closely with the W3C and ISO/IEC standard bodies; and dealing in particular with standards of the TCP/IP and Internet protocol suite.
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