正则表达式拆分 NSString - iOS

Question

在 iOS 中使用正则表达式拆分字符串

我已经使用循环解决了这个问题，但是想要一个更清晰的答案，我希望 reg exe guru 可以帮助我。

我的原始字符串可能如下所示

NSString *originalString = @"343 a mr smith needs this work";

NSString *originalStringVerTwo = @"345a mr jones needs this work as well";

NSString *originalStringVerThree = @"345 Mrs Someone";

我需要分成 3 个单独的新字符串：

• 带有或带有尾随“a”或“b”的数字，如果存在则删除它们之间的空格
• 人名，可以大写也可以不大写，例如 Mr smith 或 Mrs Jones 等
• 在此之后，零个或多个单词将出现在最终字符串中

例如

• 123a先生，这里有一些话
• 124 b 琼斯夫人 n/p
• 654 符先生
• 123 琼斯 n/p
• 345 n/p

应该会导致以下结果

第 1 行

NSString *one = 123a
NSString *two = mr who
NSString *three = here are some words

第 2 行

NSString *one = 124b // i want the white space removed between number and digit
NSString *two = mrs jones
NSString *three = n/p

第 3 行

NSString *one = 654
NSString *two = Mr Foo
NSString *three = @""

第 4 行

NSString *one = 123
NSString *two = Jones
NSString *three = n/p

第 5 行

NSString *one = 345
NSString *two = n/p
NSString *three = @""

常量将是

1. 3 位数字，带或不带“a”“b”（123、123 a、123b）
2. 人名，带或不带称呼（琼斯先生，琼斯）
3. 人名可能未知 - 因此是“n/p”的确切文本
4. 名称后面是一个长度为 n 的字符串，以 \n 结尾（这是一组单词\n）。

将空白从 123a 移除到 123a 是理想的，但不是主要要求

Answer 1

这是一个应该可以工作的正则表达式：

       ^             //start of line
       (             //first capture group
            [\d]+    //one or more digits
       )             //end of first capture group 

       (?:           //start of optional non-capturing group
              \s?    //optional whitespace
            (        //second capture group
              [ab]   //character class - a or b
            )        //end of second capture group 
       )?            //end of optional non-capturing group 

       \s            //whitespace

       (             //third capture group
            (?:      //non-capturing group
      Mr|Mrs|Mister  //title alternation
            )         
            \s       //whitespace
            [\w/]+   //1 or more word characters or "/"
       |             //alternation 
            [\w/]+   //1 or more word characters or "/"
       )             //end of third capture group 

       (?:           //start of optional non-capturing group  
            \s       //whitespace
            (        //fourth capture group
            .*       //0 or more of any character
            )        //end of fourth capture group
        )?           //end of optional non-capturing group
       $             //end of line

构建你的正则表达式。我们必须逃脱转义符以将它们保留在 NSString 中：

NSString* regexString =
@"^([\\d]+(?:\\s?[ab])?)\\s((?:Mr|Ms|Mrs|Mister)\\s[\\w/]+|[\\w/]+)(?:\\s(.*))?$";

NSRegularExpression *regex =
[NSRegularExpression regularExpressionWithPattern:regexString
                     options:NSRegularExpressionCaseInsensitive
                     error:nil];

制作一个测试数组：

NSArray* testArray = @[
                        @"123a mr who here are some words"
                       ,@"124 b mrs jones n/p"
                       ,@"654 Mr Foo"
                       ,@"123 Jones n/p"
                       ,@"345 n/p"
                       ,@"345"
                       ,@"nothing here"
                       ];

处理测试数组：

for (NSString* string in testArray) {
    NSLog(@" ");
    NSLog(@"input: '%@'",string);

    NSRange range = NSMakeRange(0,string.length);
    if ([regex numberOfMatchesInString:string options:0 range:range] == 1) {
        NSString* body = [regex stringByReplacingMatchesInString:string
                                           options:0
                                             range:range
                                      withTemplate:@"$1\n$2\n$3"];


        NSArray* result = [body componentsSeparatedByString:@"\n"];
        NSString* one = result[0];
        NSString* two = result[1];
        NSString* three = result[2];
        NSLog(@"one:   '%@'",one);
        NSLog(@"two:   '%@'",two);
        NSLog(@"three: '%@'",three);
    } else {
        NSLog(@"no match");
    }
}

输出：

    input: '123a mr who here are some words'
    one:   '123a'
    two:   'mr who'
    three: 'here are some words'

    input: '124 b mrs jones n/p'
    one:   '124b'
    two:   'mrs jones'
    three: 'n/p'

    input: '654 Mr Foo'
    one:   '654'
    two:   'Mr Foo'
    three: ''

    input: '123 Jones n/p'
    one:   '123'
    two:   'Jones'
    three: 'n/p'

    input: '345 n/p'
    one:   '345'
    two:   'n/p'
    three: ''

    input: '345'
    no match

    input: 'nothing here'
    no match