Martin Richter's algorithm (identical to Snippets and related to the 7-zip algorithm).Filip's algorithm and Vignesh Murugesan's algorithm.Rich Salz' wildmat algorithm (sh-like syntax).This is a form of backtracking, also done by some regular expression matchers. The recursion generally happens on matching * when there is more suffix to match against. Test case development and performance optimization techniques have been demonstrably brought to bear on certain algorithms, particularly those developed by critics of the recursive algorithms. Non-recursive algorithms for matching wildcards have gained favor in light of these considerations.Īmong both recursive and non-recursive algorithms, strategies for performing the pattern matching operation vary widely, as evidenced among the variety of example algorithms referenced below. Įarly algorithms for matching wildcards often relied on recursion, but the technique was criticized on grounds of performance and reliability considerations. Has an exponential runtime unless a length-bound is given in the pattern matching with flexible wildcards variant. Pattern matching with wildcards, an unanchored string search with the equivalent of both wildcards defined.Pattern matching with don't cares or gaps, an unanchored string search with only the equivalent of ? defined.This description is similar to the Levenshtein distance.ĭirectly related problems in computer science include: This is the formulation used by Richter's algorithm and the Snippets algorithm found in Cantatore's collection. Where m ij is the result of matching the pattern p against the text t truncated at i and j characters respectively. Stated in zero-based indices, the wildcard-matching problem can be defined recursively as: This article mainly discusses the Windows formulation of the problem, unless otherwise stated. * matches arbitrary many (including zero) occurrences of any character. Wildcards: ? matches exactly one occurrence of any character.The pattern can be based on any common syntax (see globbing), but on Windows programmers tend to only discuss a simplified syntax supported by the native C runtime: It performs an anchored match, returns true only when p matches the entirety of s. The problem Ī wildcard matcher tests a wildcard pattern p against an input string s. Wildcard matching is a subset of the problem of matching regular expressions and string matching in general. the Bourne shell or Microsoft Windows command-line or text editor or file manager, as well as the interfaces for some search engines and databases. Common uses of these algorithms include command-line interfaces, e.g. In computer science, an algorithm for matching wildcards (also known as globbing) is useful in comparing text strings that may contain wildcard syntax. Algorithm to compare text strings using wildcard syntax
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