CODEWITHSUNDEEP
regexnsregularexpression
nero
nero

Reputation: 64

NSRegularExpression - match multiple string

Basically, my string looks like this:

@"{{attendee.prefix}} {{attendee.firstname}} {{attendee.lastname}}, fwf<br /><span style="font-size:14px;">lalallasgabab {{attendee.weg2g}} {{attendee.5236t2gsg}}  {{attendee.ticket_no}}  agagawfbeagabs</span>"

I am trying to extract all the string which encapsulated by 2 curly braces:

[ {{attendee.prefix}}, {{attendee.firstname}}, {{attendee.lastname}}, {{attendee.weg2g}}, {{attendee.5236t2gsg}}, {{attendee.ticket_no}} ]

I have tried these regex, but it always return 1 match if not the whole string.

@"(\\{\\{.*\\}\\})" -> return the whole string

@"\\{\\{[^}]*+\\}\\}" -> only match {{attendee.firstname}}

@"\\b\\{\\{[^}]*+\\}\\}\\b" -> only match {{attendee.prefix}}

Here is my code:

NSString *myString = @"{{attendee.prefix}} {{attendee.firstname}} {{attendee.lastname}}, fwf<br /><span style="font-size:14px;">lalallasgabab {{attendee.weg2g}} {{attendee.5236t2gsg}}  {{attendee.ticket_no}}  agagawfbeagabs</span>"

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\{\\{[^}]*+\\}\\}" options:NSRegularExpressionCaseInsensitive error:nil];

NSRange visibleTextRange = NSMakeRange(0, myString.length);

NSArray *matches = [regex matchesInString:myString options:NSMatchingAnchored range:visibleTextRange];

for (NSTextCheckingResult *match in matches)
{
    NSLog(@"%@: Match - %@", [self class], [myString substringWithRange:match.range]);
}

I have tried using [match rangeAtIndex:index] but still return the same thing, sometime it is out of bound because the match result is only 1.

Appreciate any help here. Thanks.

PS: I am new to Objective-C and RegEx, so pardon this question.

Upvotes: 2

Views: 1296

Answers (2)

zx81
zx81

Reputation: 41838

To iterate over all matches like {{this}}, use this:

NSError *error = NULL;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\{\\{[^}]*\\}\\}" options:0 error:&error];
NSArray *matches = [regex matchesInString:subject options:0 range:NSMakeRange(0, [subject length])];
NSUInteger matchCount = [matches count];
if (matchCount) {
    for (NSUInteger matchIdx = 0; matchIdx < matchCount; matchIdx++) {
        NSTextCheckingResult *match = [matches objectAtIndex:matchIdx];
        NSRange matchRange = [match range];
        NSString *result = [subject substringWithRange:matchRange];
    }
}
else {  // Nah... No matches.
     }

Upvotes: 1

nero
nero

Reputation: 64

I managed to answer my own question, by using different ways of enumerating the result:

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\{\\{[^}]*+\\}\\}" options:NSRegularExpressionCaseInsensitive error:nil];

NSString *myString = @"{{attendee.prefix}} {{attendee.firstname}} {{attendee.lastname}}, fwf<br /><span style='font-size:14px;'>lalallasgabab {{attendee.weg2g}} {{attendee.5236t2gsg}}  {{attendee.ticket_no}}  agagawfbeagabs</span>";

[regex enumerateMatchesInString:myString
                        options:0
                          range:NSMakeRange(0, [myString length])
                     usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
                         NSLog(@"%@: Match - %@", [self class], [self.duplicateBody substringWithRange:result.range]);
                     }];

With the code above, I am able to iterate through each of the matched string, which is exactly what I wanted.

Upvotes: 0

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