How to extract a string from a string?

Question

I'm trying to find how to extract "2013-05-01/game1" from "/games/usa/2013-05-01/game1.html", but I don't how to do that. I already tried some Regex on it but it didn't work. And I also don't know if this would be the best way. This is what I have tried so far.

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"/[0-9]{4}-[0-9]{2}-[0-9]-{2}\//\.*$)" options:NSRegularExpressionCaseInsensitive error:NULL];
NSTextCheckingResult *newSearchString = [regex firstMatchInString:opening_time options:0 range:NSMakeRange(0, [opening_time length])];
NSString *substr = [opening_time substringWithRange:newSearchString.range];
NSLog(@"%@", substr);

Any help would be appreciated.

Can you rely on the format surrounding the string? Will it always be like your example? — Keith Smiley
– Keith Smiley, Commented Jul 20, 2013 at 5:23

j_lentini · Accepted Answer · 2013-07-20 05:31:22Z

4

One way would be to use NSString's componentsSeparatedByString: method. Here's an example

NSString *str = [@"/games/usa/2013-05-01/game1.html" stringByDeletingPathExtension];
NSArray *components = [str componentsSeparatedByString:@"/"];
NSString *result = [NSString stringWithFormat:@"%@/%@", [components objectAtIndex:3], [components objectAtIndex:4]];
NSLog(@"%@", result);

Of course, this would rely on the fact that the format never changes, and this most likely won't work if it does change.

edited Jul 20, 2013 at 5:31

answered Jul 20, 2013 at 5:26

j_lentini

5,7456 gold badges45 silver badges65 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

hd1 Over a year ago

Regex is often overkill for 90% of cases when it is used. Good on you for pointing out a straightforward solution.

Casimir et Hippolyte · Accepted Answer · 2013-07-20 05:24:05Z

2

try this:

@"[0-9]{4}-[0-9]{2}-[0-9]{2}/[^.]+"

or this:

@"[0-9]{4}-[0-9]{2}-[0-9]{2}/.+?(?=\\.html)"

answered Jul 20, 2013 at 5:24

Casimir et Hippolyte

90k5 gold badges102 silver badges131 bronze badges

1 Comment

Guilherme Miranda Over a year ago

That works too, but i'll keep the other one as the answer based on what @hd1 said! But thanks!

Collectives™ on Stack Overflow

How to extract a string from a string?

2 Answers 2

1 Comment

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related