Search results
Results From The WOW.Com Content Network
Given regular expressions R and S, the following operations over them are defined to produce regular expressions: (concatenation) (RS) denotes the set of strings that can be obtained by concatenating a string accepted by R and a string accepted by S (in that order). For example, let R denote {"ab", "c"} and S denote {"d", "ef"}.
The algorithm works recursively by splitting an expression into its constituent subexpressions, from which the NFA will be constructed using a set of rules. [3] More precisely, from a regular expression E, the obtained automaton A with the transition function Δ [clarification needed] respects the following properties:
R k ij = R k-1 ik (R k-1 kk) * R k-1 kj | R k-1 ij. Another way to understand the operation of the algorithm is as an "elimination method", where the states from 0 to n are successively removed: when state k is removed, the regular expression R k-1 ij, which describes the words that label a path from state i>k to state j>k, is rewritten into R k
Given a set of strings (also called "positive examples"), the task of regular language induction is to come up with a regular expression that denotes a set containing all of them. As an example, given {1, 10, 100}, a "natural" description could be the regular expression 1⋅0 *, corresponding to the informal characterization "a 1 followed by ...
In theoretical computer science and formal language theory, a regular language (also called a rational language) [1] [2] is a formal language that can be defined by a regular expression, in the strict sense in theoretical computer science (as opposed to many modern regular expression engines, which are augmented with features that allow the recognition of non-regular languages).
Pages in category "Regular expressions" The following 12 pages are in this category, out of 12 total. This list may not reflect recent changes. ...
RegExp.prototype.test() The test() method executes a search for a match between a regular expression and a specified string. Returns true or false. Javascript regular expressions aren’t that ...
For example, insource:/".*"/ means the same thing as insource:/\.\*/. The character # is also a metacharacter and must be escaped. [clarification needed] Regex experts should note that \n does not mean "newline," \d does not mean "digit," and so on. Regex experts should note that ^ does not mean "beginning of text" and $ does not mean "end of ...