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The reverse of a string is a string with the same symbols but in reverse order. For example, if s = abc (where a, b, and c are symbols of the alphabet), then the reverse of s is cba. A string that is the reverse of itself (e.g., s = madam) is called a palindrome, which also includes the empty string and all strings of length 1.
Anadrome: a word or phrase that reads as a different word or phrase in reverse; Apronym: an acronym that is also a phrase pertaining to the original meaning RAS syndrome: repetition of a word by using it both as a word alone and as a part of the acronym; Recursive acronym: an acronym that has the acronym itself as one of its components
Some words will, when transformed with ROT13, produce another word. Examples of 7-letter pairs in the English language are abjurer and nowhere, and Chechen and purpura. Other examples of words like these are shown in the table. [12] The pair gnat and tang is an example of words that are both ROT13 reciprocals and reversals.
A simple and inefficient way to see where one string occurs inside another is to check at each index, one by one. First, we see if there is a copy of the needle starting at the first character of the haystack; if not, we look to see if there's a copy of the needle starting at the second character of the haystack, and so forth.
The 19-letter Finnish word saippuakivikauppias (a soapstone vendor) is the longest single-word palindrome in everyday use, while the 12-letter term tattarrattat (from James Joyce in Ulysses) is the longest in English. The word palindrome was introduced by English poet and writer Henry Peacham in 1638. [1]
A string s = abc, composed of zero or more characters of the alphabet (here, 'a', 'b', and 'c'), is said to be the reverse of string t if t = cba. For example, if Σ = {0,1} the string 0011001 is the reverse of 1001100. A string that is the reverse of itself is also called a palindrome, which includes the empty string and all strings of length 1.
A string homomorphism (often referred to simply as a homomorphism in formal language theory) is a string substitution such that each character is replaced by a single string. That is, f ( a ) = s {\displaystyle f(a)=s} , where s {\displaystyle s} is a string, for each character a {\displaystyle a} .
In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth.