问题
Split String using Regular Expression in iOS
I have solved this problem using loops, however would like a cleaner answer and I hope a reg exe guru can help me out.
My original string could be like the following
NSString *originalString = @"343 a mr smith needs this work";
NSString *originalStringVerTwo = @"345a mr jones needs this work as well";
NSString *originalStringVerThree = @"345 Mrs Someone";
I need to separate into 3 separate new strings:
- Number with or with a trailing "a" or "b", remove white space between if exists
- Person name, maybe capital or not, ie mr smith or Mrs Jones etc
- After this, zero or more words to be in the final string
For example
- 123a mr who here are some words
- 124 b mrs jones n/p
- 654 Mr Foo
- 123 Jones n/p
- 345 n/p
Should result in the following
line 1
NSString *one = 123a
NSString *two = mr who
NSString *three = here are some words
line 2
NSString *one = 124b // i want the white space removed between number and digit
NSString *two = mrs jones
NSString *three = n/p
line 3
NSString *one = 654
NSString *two = Mr Foo
NSString *three = @""
line 4
NSString *one = 123
NSString *two = Jones
NSString *three = n/p
line 5
NSString *one = 345
NSString *two = n/p
NSString *three = @""
The constants will be
- 3 digit number with or without an "a" "b" (123, 123 a, 123b)
- A persons name, with or without salutation (Mr jones, jones)
- The persons name could be unknown - hence the exact text of "n/p"
- Following the name is a string of n length that will end with a \n (this is a set of words\n).
The removal of the white space from 123 a into 123a is ideal but not major requirement
回答1:
Here's a regex that should work:
^ //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
Construct your regex. We have to escape the escapes to retain them in an NSString:
NSString* regexString =
@"^([\\d]+(?:\\s?[ab])?)\\s((?:Mr|Ms|Mrs|Mister)\\s[\\w/]+|[\\w/]+)(?:\\s(.*))?$";
NSRegularExpression *regex =
[NSRegularExpression regularExpressionWithPattern:regexString
options:NSRegularExpressionCaseInsensitive
error:nil];
Make a test array:
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"
];
Process the test array:
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");
}
}
Output:
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
来源：https://stackoverflow.com/questions/18799566/regular-expression-splitting-up-of-nsstring-ios