如何在NSMutableString中修剪“”和“\ n”

Question

如何在NSMutableString中修剪“”和“\ n”？

Answer 1

NSCharacterSet* charsToTrim = [NSCharacterSet characterSetWithCharactersInString:@" \n"];
NSString* trimmedStr = [aStr stringByTrimmingCharactersInSet:charsToTrim];

Answer 2

我知道这是一个老问题，但是，可以修剪一个可变字符串而无需返回一个新字符串。你只需要一个正则表达式，如下所示：

NSMutableString *mutable = [NSMutableString stringWithString:@" String to trim    \n"];

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\n|  | $|^ " options:0 error:nil];
[regex replaceMatchesInString:mutable options:0 range:NSMakeRange(0, [mutable length]) withTemplate:@""];

Answer 3

如何调用replaceOccurrencesOfString：withString：options：range两次，替换“”然后“\ n”替换为什么？

Answer 4

NSString *trimmed = [yourString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];