regular expression - definitie. Wat is regular expression
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Wat (wie) is regular expression - definitie


regular expression         
1. <text, operating system> (regexp, RE) One of the {wild card} patterns used by Perl and other languages, following Unix utilities such as grep, sed, and awk and editors such as vi and Emacs. Regular expressions use conventions similar to but more elaborate than those described under glob. A regular expression is a sequence of characters with the following meanings: An ordinary character (not one of the special characters discussed below) matches that character. A backslash () followed by any special character matches the special character itself. The special characters are: "." matches any character except NEWLINE; "RE*" (where the "*" is called the "Kleene star") matches zero or more occurrences of RE. If there is any choice, the longest leftmost matching string is chosen, in most regexp flavours. "^" at the beginning of an RE matches the start of a line and "$" at the end of an RE matches the end of a line. [string] matches any one character in that string. If the first character of the string is a "^" it matches any character except the remaining characters in the string (and also usually excluding NEWLINE). "-" may be used to indicate a range of consecutive ASCII characters. ( RE ) matches whatever RE matches and , where n is a digit, matches whatever was matched by the RE between the nth ( and its corresponding ) earlier in the same RE. Many flavours use ( RE ) used instead of ( RE ). The concatenation of REs is a RE that matches the concatenation of the strings matched by each RE. RE1 | RE2 matches whatever RE1 or RE2 matches. < matches the beginning of a word and > matches the end of a word. In many flavours of regexp, > and < are replaced by "", the special character for "word boundary". REm matches m occurences of RE. REm, matches m or more occurences of RE. REm,n matches between m and n occurences. The exact details of how regexp will work in a given application vary greatly from flavour to flavour. A comprehensive survey of regexp flavours is found in Friedl 1997 (see below). [Jeffrey E.F. Friedl, "{regular expressionjfriedl/regex/index.html">Mastering Regular Expressions (http://enterprise.ic.gc.ca/regular expressionjfriedl/regex/index.html)}, O'Reilly, 1997]. 2. Any description of a pattern composed from combinations of symbols and the three operators: Concatenation - pattern A concatenated with B matches a match for A followed by a match for B. Or - pattern A-or-B matches either a match for A or a match for B. Closure - zero or more matches for a pattern. The earliest form of regular expressions (and the term itself) were invented by mathematician Stephen Cole Kleene in the mid-1950s, as a notation to easily manipulate "regular sets", formal descriptions of the behaviour of {finite state machines}, in regular algebra. [S.C. Kleene, "Representation of events in nerve nets and finite automata", 1956, Automata Studies. Princeton]. [J.H. Conway, "Regular algebra and finite machines", 1971, Eds Chapman & Hall]. [Sedgewick, "Algorithms in C", page 294]. (2004-02-01)
Regular expression         
A regular expression (shortened as regex or regexp; sometimes referred to as rational expression) is a sequence of characters that specifies a search pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation.
Clerics regular         
A CATHOLIC PRIEST, DEACON OR BISHOP WHO IS A MEMBER OF A RELIGIOUS INSTITUTE
Clerk regular; Clerk Regular; Regular Clerk; Regular Clerks; Clerks regular; Regular clerics; Clerks Regular; Clerics Regular; Clerics regular
Clerics regular are clerics (mostly priests) who are members of a religious order under a rule of life (regular). Clerics regular differ from canons regular in that they devote themselves more to pastoral care, in place of an obligation to the praying of the Liturgy of the Hours in common, and have fewer observances in their rule of life.

Wikipedia

Regular expression
A regular expression (shortened as regex or regexp; sometimes referred to as rational expression) is a sequence of characters that specifies a search pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation.