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  2. Longest common substring - Wikipedia

    en.wikipedia.org/wiki/Longest_common_substring

    The array L stores the length of the longest common suffix of the prefixes S[1..i] and T[1..j] which end at position i and j, respectively. The variable z is used to hold the length of the longest common substring found so far. The set ret is used to hold the set of strings which are of length z.

  3. Levenshtein distance - Wikipedia

    en.wikipedia.org/wiki/Levenshtein_distance

    It is at least the absolute value of the difference of the sizes of the two strings. It is at most the length of the longer string. It is zero if and only if the strings are equal. If the strings have the same size, the Hamming distance is an upper bound on the Levenshtein distance. The Hamming distance is the number of positions at which the ...

  4. Kleene star - Wikipedia

    en.wikipedia.org/wiki/Kleene_star

    If is a set of symbols or characters, then is the set of all strings over symbols in , including the empty string . The set V ∗ {\\displaystyle V^{*}} can also be described as the set containing the empty string and all finite-length strings that can be generated by concatenating arbitrary elements of V {\\displaystyle V} , allowing the use ...

  5. Zero-width space - Wikipedia

    en.wikipedia.org/wiki/Zero-width_space

    The zero-width space can be used to mark word breaks in languages without visible space between words, such as Thai, Myanmar, Khmer, and Japanese. [ 1 ] In justified text, the rendering engine may add inter-character spacing, also known as letter spacing, between letters separated by a zero-width space, unlike around fixed-width spaces.

  6. Empty string - Wikipedia

    en.wikipedia.org/wiki/Empty_string

    The empty string should not be confused with the empty language ∅, which is a formal language (i.e. a set of strings) that contains no strings, not even the empty string. The empty string has several properties: |ε| = 0. Its string length is zero. ε ⋅ s = s ⋅ ε = s. The empty string is the identity element of the concatenation operation

  7. Word spacing - Wikipedia

    en.wikipedia.org/wiki/Word_spacing

    Word spacing has the ability to express the meaning and idea behind a word, which typographers consider when working on design works and text. [9] With a written piece of text, the designer has to remember to make sure they do not add too much or too little space between words; otherwise it could ruin the texture and tone.

  8. Edit distance - Wikipedia

    en.wikipedia.org/wiki/Edit_distance

    A generalization of the edit distance between strings is the language edit distance between a string and a language, usually a formal language. Instead of considering the edit distance between one string and another, the language edit distance is the minimum edit distance that can be attained between a fixed string and any string taken from a ...

  9. Word2vec - Wikipedia

    en.wikipedia.org/wiki/Word2vec

    Word2vec is a technique in natural language processing (NLP) for obtaining vector representations of words. These vectors capture information about the meaning of the word based on the surrounding words. The word2vec algorithm estimates these representations by modeling text in a large corpus.