【语法】: ①(right of =) Function,提取字符: Substr(s,p,n)从字符串s中的第p个字符开始提取n个字符的子串 ②(left of =) Function,字符替换: Substr(s,p,n)=characters-to-replace,从变量s的第p个字符开始替换n个字符 【注意】: ①必须是从字符变量...
SUBSTR(right of = )Function Extracts a substring from an argument. 返回X字符串的一个子串 Syntax <variable=>SUBSTR(string, position<,length>) Details In a DATA step, if the SUBSTR (right of =) function returns a value to a variable that has not prev...
经过实测发现,strip用于去除两端空格,left把左边空格移到右边,right则把右边空格移到左边,trim去除右边空格。 7、其他函数 1)UPCASE, LOWCASE, PROPCASE: 分别用于将字符串转换为全大写、全小写、首字母大写其余小写。 2)LENGTH: 返回字符串的长度。 141 data xaa; 142 ucs = upcase('function'); 143 lcs ...
DEQUOTE Function Removes matching quotation marks from a character string that begins with a quotation mark, and deletes all characters to the right of the closing quotation mark. FIND Function Searches for a specific substring of characters within a character string. FINDC Function Searches a stri...
SQL Server中一共提供了三个字符串截取函数:LEFT().RIGHT().SUBSTRING(). 一.LEFT()函数 函数说明如下: 语法:LEFT(character,integer). 参数介绍:参数1:要截取的字符串,参数2:截取字符个数. 返回值:返回从字符串左边开始指定个数的字符. 示例SQL:select LEFT('SQLServer_2012',3). 返回:SQL. 二.RIGHT()...
DEQUOTE Function Removes matching quotation marks from a character string that begins with a quotation mark, and deletes all characters to the right of the closing quotation mark. FIND Function Searches for a specific substring of characters within a character string. FINDC Function Searches a ...
方法二:动态规划法用一个二维的数组ai来表示从第i位到第j位的子串是不是回文串,在判断从i到j的子串是不是回文串时,可以先看i+1到j-1是不是回文串,再判断i位和j位是不是相同。...引入变量maxright表示当前访问到的所有回文子串,所能触及的最右一个字符的位置;同时记录maxright所对应的回文串的对称轴的...
SUBPAD Function Returns a substring that has a length you specify, using blank padding if necessary. SUBSTR (left of =) Function Replaces character value contents. SUBSTR (right of =) Function Extracts a substring from an argument. SUBSTRN Function Returns a substring, allowing a result with ...
Since the backslash, forward slash, parentheses and several other characters have special meaning in a regular expression, you may wonder, how do you search a string for a \ character or a left or right parenthesis? You do this by preceding any of these special characters with a backslash ...
2017-08-08 15:27 −总结多个字符串常用函数 1.Substr(s,p,n) 【功能】:字符串的替换和字符串的提取 【语法】: 1.(right of =) Function,提取字符:Substr(s,p,n)从字符串s中的第p个字符开始提取n个字符的子串。2 (left of =) Function,字符替换:Sub... ...