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  2. Comparison of regular expression engines - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_regular...

    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

  3. Regular expression - Wikipedia

    en.wikipedia.org/wiki/Regular_expression

    It specifies a limited subset of regular-expression idioms designed to be interoperable, i.e. produce the same effect, in a large number of regular-expression libraries. I-Regexp is also limited to matching, i.e. providing a true or false match between a regular expression and a given piece of text.

  4. Comparison of programming languages (string functions)

    en.wikipedia.org/wiki/Comparison_of_programming...

    String functions common to many languages are listed below, including the different names used. The below list of common functions aims to help programmers find the equivalent function in a language. Note, string concatenation and regular expressions are handled in separate pages.

  5. grep - Wikipedia

    en.wikipedia.org/wiki/Grep

    grep is a command-line utility for searching plaintext datasets for lines that match a regular expression.Its name comes from the ed command g/re/p (global regular expression search and print), which has the same effect.

  6. Python syntax and semantics - Wikipedia

    en.wikipedia.org/wiki/Python_syntax_and_semantics

    Python supports normal floating point numbers, which are created when a dot is used in a literal (e.g. 1.1), when an integer and a floating point number are used in an expression, or as a result of some mathematical operations ("true division" via the / operator, or exponentiation with a negative exponent).

  7. Conditional (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Conditional_(computer...

    ^ This refers to pattern matching as a distinct conditional construct in the programming language – as opposed to mere string pattern matching support, such as regular expression support. 1 2 An #ELIF directive is used in the preprocessor sub-language that is used to modify the code before compilation; and to include other files.

  8. AWK - Wikipedia

    en.wikipedia.org/wiki/AWK

    The BEGIN is necessary not only to extract the first argument, but also to prevent it from being interpreted as a filename after the BEGIN block ends. ARGC, the number of arguments, is always guaranteed to be ≥1, as ARGV[0] is the name of the command that executed the script, most often the string "awk". ARGV[ARGC] is the empty string, "".

  9. Switch statement - Wikipedia

    en.wikipedia.org/wiki/Switch_statement

    In many languages, only the matching block is executed, and then execution continues at the end of the switch statement. These include the Pascal family (Object Pascal, Modula, Oberon, Ada, etc.) as well as PL/I , modern forms of Fortran and BASIC dialects influenced by Pascal, most functional languages, and many others.

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