字符串中怎么截取指定字符的前面的字符和后面的字符
\u5b57\u7b26\u4e32\u4e2d\u600e\u4e48\u622a\u53d6\u6307\u5b9a\u5b57\u7b26\u7684\u524d\u9762\u7684\u5b57\u7b26\u548c\u540e\u9762\u7684\u5b57\u7b26var str = 'abcd';
str.substr(0, str.indexOf('b') + 1);
"ab"
var str = 'abcd';
str.substr(str.indexOf('b') + 1);
"cd"
String str = "afhakhfakshfka\u6307\u5b9a\u5b57\u7b26adasfasfa"; System.out.println(str.replaceAll("[^a-zA-Z]", "")); \u770b\u4e0b\u662f\u4e0d\u662f\u4f60\u8981\u7684\u7ed3\u679c\u5475\u5475
1）rangeOfString:截取指定字符串的长度；2） substringToIndex:7：截取从0 索引到指定索引（7）长度的字符串
3） substringFromIndex:9：截取从指定索引（9）到末尾长度的字符串
4） NSRange range = NSMakeRange(0,7);截取从指定索引（0）到指定（7）长度的字符串
5） substringWithRange:range：截取从指定索引（0）到指定（7）长度的字符串
6 )isEqualToString:@"p://www"：比较字符串包含关系，区分大小写
7) stringWithFormat:格式化字符串。
void findSubString(){
NSString *filename = @"config.ini";
NSString *escapedPath = @"/Users/config.ini";
//在escapedPath中查找filename
//NSRange iStart = [escapedPath rangeOfString :filename];
NSRange iStart = [escapedPath rangeOfString: filename options:NSCaseInsensitiveSearch];
// NSLog(@"iStart length is %@:",iStart.length);
// NSLog(@"iStart location is %@:",iStart.location);
if (iStart.length > 0){
//获取从escapedPath开始位置到iStart.location-1长度的子字符串
NSString *subStr = [escapedPath substringToIndex:iStart.location-1];
NSLog(@"subStr:%@",subStr);
//获取从escapedPath从iStart.location+1开始到末尾的子字符串
NSString *extension = [escapedPath substringFromIndex:iStart.location]; //往后久在加上搜索字符串的长度
NSLog(@"extension:%@",extension);
NSString *url =@"http://www.sevenuc.com";
NSRange range = NSMakeRange(3,7);
NSString* prefix = [url substringWithRange:range];
NSLog(@"prefix is:%@",prefix);
if([prefix isEqualToString:@"p://www"])
{
NSLog(@"prefix is equal %@",prefix);
}
else {
NSLog(@"prefix is not equal %@",prefix);
}
//获取url从0开始共7个字符的子字符串
if ( [prefix isEqualToString:@"http://"] )
NSLog(@"http prefix found");
}
}
void formatString(){
int documentId=100;
NSString *documentFileName=@"test.doc";
NSString *requestSring=[NSString stringWithFormat:@"<files><fileid>%d</fileid><filename>%@</filename></files>",documentId,documentFileName];
NSLog(@"requestString:%@",requestSring);
}
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