substring()从提取的字符indexStart可达但不包括 indexEnd 如果indexStart 等于indexEnd,substring()返回一个空字符串。 如果indexEnd省略,则将substring()字符提取到字符串的末尾。 如果任一参数小于0或是NaN,它被视为为0。 如果任何一个参数都大于stringName.length,则被视
substr string from end of the string 2 Thread starter himridul Start date Feb 2, 2010 Not open for further replies. Feb 2, 2010 #1 himridul Programmer Jun 23, 2003 62 US Hi, I have number of files in a dir name ends with ?.err where ? is single literal. For example, the...
1.start不一定就是第一个參数,end也不一定就是第二个參数,substring(3,1)时,開始位置是1,结束位置是3; 2.当要返回的子字符串是从開始位置到结束时,end的值必须大于等于字符串的长度,如上边的str.substring(7,8),依照索引从0開始算的话end的最大值为7,但这边却用8,当然,使用大于8的数返回的结果也是一...
subString的用法public static void main(String[] args) { // substring(beginIndex,endindex); 根据索引用来截取 String 类型的值 返回一个新的字符串 // 参数： beginIndex - 开始处的索引（包括）。// endindex 结尾处索引（不包括）。String s="abcdef"; //重 s= s.substring(1,5);Syste...
Ifpositionis negative, then Oracle counts backward from the end ofstring. Ifsubstring_lengthis omitted, then Oracle returns all characters to the end ofstring. Ifsubstring_lengthis less than 1, then Oracle returns null. stringcan be any of the datatypesCHAR,VARCHAR2,NCHAR,NVARCHAR2,CLOB, orNC...
substring()从提取的字符indexStart可达但不包括 indexEnd 如果为indexStart 等于indexEnd,substring()返回一个空字符串。 如果indexEnd省略,则将substring()字符提取到字符串的末尾。 如果任一参数小于0或是NaN,它被视为为0。 如果任何一个参数都大于stringName.length,则被视为是stringName.length。
如果indexStart 等于indexEnd,substring()返回一个空字符串。 如果indexEnd省略,则将substring()字符提取到字符串的末尾。 如果任一参数小于0或是NaN,它被视为为0。 如果任何一个参数都大于stringName.length,则被视为是stringName.length。 如果indexStart大于indexEnd,那么效果substring()就好像这两个论点被交换了...
string.substr(start,length) Arguments start The start position of the substring. If this argument is negative, it specifies a position measured from the end of the string: -1 specifies the last character, -2 specifies the second-to-last character, and so on. ...
SUBSTR2 supports a negative start value, which indicates that processing is to start from the end of the string. SUBSTR2 supports alengthvalue that is greater than the calculated result length. In such cases, a shorter string is returned, rather than an error. ...
thestr. If thestart_positionis positive, theSUBSTR()function will count from the beginning of thestrto determine the first character of the substring. If thestart_positionis negative, then theSUBSTR()function will count backward from the end of thestrto find the first character of the ...