A concise description of a regular formal language with notations for concatenation, alternation, and iteration (repetition) of subexpressions
Any pattern for text matching or searching, frequently offering more or less functionality than a theoretical regular expression
A regular expression is a pattern that can match various text strings; for example, `l[0-9]+' matches `l' followed by one or more digits @xref{Regexps}
A regular expression is a pattern that can match various text strings; for example, `l[0-9]+' matches `l' followed by one or more digits See section Syntax of Regular Expressions
A regular expression is a pattern that can match various text strings; for example, `l[0-9]+' matches `l' followed by one or more digits See Regexps
Regular Expressions use Meta Characters to express variable parts of a pattern to be matched Regular Expression [Buy the Book] (rezidew)
(n ) A pattern representing a class of character strings For example, grep interprets the regular expression h t as any three-character string beginning with h and ending with t
a text pattern consisting of alphanumeric characters and special characters, known as metacharacters In vi, ex, and ed, a character string that specifies one or more lines of the file by matching its contents in various ways Search patterns are regular expressions
A regular expression is a pattern that can match various text strings; for example, `a[0-9]+' matches `a' followed by one or more digits See section K 5 Syntax of Regular Expressions
wild card pattern used by Unix utilities; any pattern containing symbols and three operators; class of strings that can be recognized by a finite-state automaton
a text pattern consisting of a combination of alphanumeric characters and special characters known as metacharacters
A form of expression that is used in Proxy for wildcard patterns for access control
A formal expression of a string pattern which can be searched for and processed by a pattern-matching program such as vi, grep, awk or perl
a string following the rules of a regular language, used to describe a class of strings (that can be recognized by an FSA), allowing alternatives, specifying a sequence, and indicating number of occurrences (0, 1, any number, at least one)
(1) A mechanism to select specific strings from a set of character strings (2) A set of characters, metacharacters, and operators that define a string or group of strings in a search pattern (3) A string containing wildcard characters and operations that define a set of one or more possible strings
Often abbreviated as a regexp, this is a method of specifing a pattern to match in text Both very simple and very complex patterns can be easily matched using this method For information on how to understand and construct regular expressions the best source is the grep manual or info page
A notation that is used to specify and match strings A regular expression might be used when you are unsure of the exact string, for example
A regular expression is a pattern that can match various text strings; for example, l[0-9]+ matches l followed by one or more digits Section 14 5
Regular sets and expressions derive from a very formal decomposition of language structure In the mmCIF dictionary, a regular expression notation is used to define the patterns which must be matched by values of a data item For instance, a calendar date in the mmCIF dictionary must match a pattern like yyyy-mm-dd, which can be defined by the regular expression [0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]