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  2. Semi-Thue system - Wikipedia

    en.wikipedia.org/wiki/Semi-Thue_system

    A string rewriting system or semi-Thue system is a tuple (,) where . is an alphabet, usually assumed finite. [5] The elements of the set (* is the Kleene star here) are finite (possibly empty) strings on , sometimes called words in formal languages; we will simply call them strings here.

  3. Python (programming language) - Wikipedia

    en.wikipedia.org/wiki/Python_(programming_language)

    Python uses the + operator for string concatenation. Python uses the * operator for duplicating a string a specified number of times. The @ infix operator is intended to be used by libraries such as NumPy for matrix multiplication. [104] [105] The syntax :=, called the "walrus operator", was introduced in Python 3.8. It assigns values to ...

  4. Codecademy - Wikipedia

    en.wikipedia.org/wiki/Codecademy

    Codecademy is an American online interactive platform that offers free coding classes in 13 different programming languages including Python, Java, Go, JavaScript, Ruby, SQL, C++, C#, Lua, and Swift, as well as markup languages HTML and CSS.

  5. For Beginners - Wikipedia

    en.wikipedia.org/wiki/For_Beginners

    For Beginners LLC is a publishing company based in Danbury, Connecticut, that publishes the For Beginners graphic nonfiction series of documentary comic books on complex topics, covering an array of subjects on the college level. Meant to appeal to students and "non-readers", as well as people who wish to broaden their knowledge without ...

  6. Regular expression - Wikipedia

    en.wikipedia.org/wiki/Regular_expression

    A similar convention is used in sed, where search and replace is given by s/re/replacement/ and patterns can be joined with a comma to specify a range of lines as in /re1/,/re2/. This notation is particularly well known due to its use in Perl, where it forms part of the syntax distinct from normal string literals. In some cases, such as sed and ...

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  8. Edit distance - Wikipedia

    en.wikipedia.org/wiki/Edit_distance

    Ukkonen's 1985 algorithm takes a string p, called the pattern, and a constant k; it then builds a deterministic finite state automaton that finds, in an arbitrary string s, a substring whose edit distance to p is at most k [13] (cf. the Aho–Corasick algorithm, which similarly constructs an automaton to search for any of a number of patterns ...

  9. Replacement - Wikipedia

    en.wikipedia.org/wiki/Replacement

    Text replacement (disambiguation) String replacement; Replacement character, a replacement, a substitute character replacing a missing from available fonts; Replace (command), a command used on DOS, Microsoft Windows and related operating systems