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Regular Expression Flavor Comparison – Detailed comparison of the most popular regular expression flavors; Regexp Syntax Summary; Online Regular Expression Testing – with support for Java, JavaScript, .Net, PHP, Python and Ruby; Implementing Regular Expressions – series of articles by Russ Cox, author of RE2; Regular Expression Engines
Regular expressions are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Regular expressions are supported in many programming languages. Library implementations are often called an "engine", [4] [5] and many of these are ...
Thompson's is one of several algorithms for constructing NFAs from regular expressions; [5] an earlier algorithm was given by McNaughton and Yamada. [6] Converse to Thompson's construction, Kleene's algorithm transforms a finite automaton into a regular expression.
The raw input, the 43 characters, must be explicitly split into the 9 tokens with a given space delimiter (i.e., matching the string " "or regular expression /\s{1}/). When a token class represents more than one possible lexeme, the lexer often saves enough information to reproduce the original lexeme, so that it can be used in semantic analysis .
The Summary. Obesity dipped slightly in U.S. adults last year for the first time in more than a decade, a study found. The researchers suggested that might be due, in part, to the rise of weight ...
In computing, the term text processing refers to the theory and practice of automating the creation or manipulation of electronic text.Text usually refers to all the alphanumeric characters specified on the keyboard of the person engaging the practice, but in general text means the abstraction layer immediately above the standard character encoding of the target text.
Two-time Grand Slam champion Simona Halep, working her way back from a drug suspension, and Hall of Famer Lleyton Hewitt's 16-year-old son Cruz were among the players awarded wild-card entries ...
The Pittsburgh Steelers host the reigning back-to-back champion Kansas City Chiefs in the first of the two holiday games. The Baltimore Ravens and Houston Texans also go head-to-head in the ...