字符串或串(String)是由数字、字母、下划线组成的一串字符。一般记为 s “a1a2···an”(n> 0)。它是编程语言中表示文本的数据类型。在程序设计中，字符串（string）为符号或数值的一个连续序列，如符号串（一串字符）或二进制数字串（一串二进制数字）。

通常以串的整体作为操作对象，如：在串中查找某个子串、求取一个子串、在串的某个位置上插入一个子串以及删除一个子串等。两个字符串相等的充要条件是：长度相等，并且各个对应位置上的字符都相等。设p、q是两个串，求q在p中首次出现的位置的运算叫做模式匹配。串的两种最基本的存储方式是顺序存储方式和链接存储方式。-Strings or string (String) is a string of characters consisting of numbers, letters, the underscore. Is generally referred to as s　 " a1a2an"　(n>　　0). It is a programming language indicates the data type of text. In programming, a string (string) is a symbol or a continuous numerical sequence, such as a symbol string (string of characters) or binary digit string (a string of binary digits). Typically whole string as the operation target, such as: Find a substring in the string, a substring is obtained, inserting a substring of string in a certain position on a sub-string and deleting the like. Sufficient Conditions two strings are equal: equal length, and the character corresponding to the respective positions are equal. Provided p, q are two strings, the first occurrence of q seek operation in the p position is called pattern matching. Two basic ways to store strings of sequential storage and links stored.