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• Regular_expression abstract "In theoretical computer science and formal language theory, a regular expression (abbreviated regex or regexp) is a sequence of characters that forms a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. The concept arose in the 1950s, when the American mathematician Stephen Kleene formalized the description of a regular language, and came into common use with the Unix text processing utilities ed, an editor, and grep (global regular expression print), a filter.Each character in a regular expression is either understood to be a metacharacter with its special meaning, or a regular character with its literal meaning. Together, they can be used to identify textual material of a given pattern, or process a number of instances of it that can vary from a precise equality to a very general similarity of the pattern. The pattern sequence itself is an expression that is a statement in a language designed specifically to represent prescribed targets in the most concise and flexible way to direct the automation of text processing of general text files, specific textual forms, or of random input strings.A very simple use of a regular expression would be to locate the same word spelled two different ways in a text editor, for example seriali[sz]e. A wildcard match can also achieve this, but wildcard matches differ from regular expressions in that wildcards are limited to what they can pattern (having fewer metacharacters and a simple language-base), whereas regular expressions are not. A usual context of wildcard characters is in globbing similar names in a list of files, whereas regular expressions are usually employed in applications that pattern-match text strings in general. For example, the simple regexp ^[ \t]+|[ \t]+$ matches excess whitespace at the beginning and end of a line. An advanced regexp used to match any numeral is ^[+-]?(\d+\.?\d*|\.\d+)([eE][+-]?\d+)?$. See Examples for more examples.A regular expression processor processes a regular expression statement expressed in terms of a grammar in a given formal language, and with that examines the target text string, parsing it to identify substrings that are members of its language, the regular expressions.Regular expressions are so useful in computing that the various systems to specify regular expressions have evolved to provide both a basic and extended standard for the grammar and syntax; modern regular expressions heavily augment the standard. Regular expression processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK.Many programming languages provide regular expression capabilities, some built-in, for example Perl, Ruby, AWK, and Tcl, and others via a standard library, for example .NET languages, Java, Python and C++ (since C++11).Most other languages offer regular expressions via a library.".
• Regular_expression thumbnail The_river_effect_in_justified_text.jpg?width=300.
• Regular_expression wikiPageExternalLink patterns.
• Regular_expression wikiPageExternalLink A05.html.
• Regular_expression wikiPageExternalLink structural_regexps.
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• Regular_expression wikiPageExternalLink ch10.pdf.
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• Regular_expression wikiPageExternalLink xbd_chap09.html.
• Regular_expression wikiPageExternalLink regex.info.
• Regular_expression wikiPageExternalLink regexp.
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• Regular_expression wikiPageExternalLink regexp.pdf.
• Regular_expression wikiPageExternalLink icalp08.pdf.
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• Regular_expression wikiPageExternalLink Regular_Expressions.
• Regular_expression wikiPageExternalLink RegExp.
• Regular_expression wikiPageID "25717".
• Regular_expression wikiPageRevisionID "606548618".
• Regular_expression hasPhotoCollection Regular_expression.
• Regular_expression subject Category:Automata_theory.
• Regular_expression subject Category:Formal_languages.
• Regular_expression subject Category:Pattern_matching.
• Regular_expression subject Category:Programming_constructs.
• Regular_expression subject Category:Regular_expressions.
• Regular_expression type Abstraction100002137.
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• Regular_expression type FormalLanguages.
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• Regular_expression comment "In theoretical computer science and formal language theory, a regular expression (abbreviated regex or regexp) is a sequence of characters that forms a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations.".
• Regular_expression label "Espressione regolare".
• Regular_expression label "Expresión regular".
• Regular_expression label "Expression rationnelle".
• Regular_expression label "Expressão regular".
• Regular_expression label "Regular expression".
• Regular_expression label "Reguliere expressie".
• Regular_expression label "Regulärer Ausdruck".
• Regular_expression label "Wyrażenie regularne".
• Regular_expression label "Регулярные выражения".
• Regular_expression label "تعبير نمطي".
• Regular_expression label "正则表达式".
• Regular_expression label "正規表現".
• Regular_expression sameAs Regulární_výraz.
• Regular_expression sameAs Regulärer_Ausdruck.
• Regular_expression sameAs Κανονική_έκφραση.
• Regular_expression sameAs Expresión_regular.
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• Regular_expression sameAs Expression_rationnelle.
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• Regular_expression sameAs 正規表現.
• Regular_expression sameAs 정규_표현식.
• Regular_expression sameAs Reguliere_expressie.
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• Regular_expression wasDerivedFrom Regular_expression?oldid=606548618.
• Regular_expression depiction The_river_effect_in_justified_text.jpg.
• Regular_expression isPrimaryTopicOf Regular_expression.