The patterns generally have the form of either sequences or tree structures Uses of pattern matching include outputting the locations (if any) of a pattern within a token sequence, to output some component of the matched pattern, and to substitute the matching pattern with some other token sequence (i.e., search and replace). The bracket syntax happens to be covered by regex in such an example Python's fnmatch uses a more elaborate procedure to transform the pattern into a regular expression A basic example of string searching is when the pattern and the searched text are arrays of elements of an alphabet (finite set) σ. Pattern matching software comparisons regular expressions
However, it is a useful algorithm for multiple pattern search. It was developed in 1983 by john w Obershelp and published in the dr Dobb's journal in july 1988. A fuzzy mediawiki search for angry emoticon suggests andré emotions as a result In computer science, approximate string matching (often colloquially referred to as fuzzy string searching) is the technique of finding strings that match a pattern approximately (rather than exactly)
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