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PONSRegularExpression:enumerateMatchesInString hangs when called more than once
 

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    <p>In the context of an iPhone app I am developing, I am parsing some html to extract data to map, using NSRegularExpression. This information is updated whenever the user "pans" the map to a new location. </p> <p>This works fine the first time or two through, but on the second or third time the function is called, the application hangs. I have used XCode's profiler to confirm I am not leaking memory, and no error is generated (the application does not terminate, it just sits in execution at the point shown below).</p> <p>When I examine the HTML being parsed, I do not see that it is incomplete or otherwise garbled when the application hangs.</p> <p>Furthermore, if I replace the regex code with a collection of explicitly address strings, everything works as expected. </p> <pre><code>- (void)connectionDidFinishLoading:(NSURLConnection *)connection { // receivedData contains the returned HTML NSString *result = [[NSString alloc] initWithData:receivedData encoding:NSASCIIStringEncoding]; NSError *error = nil; NSString *pattern = @"description.*?h4&gt;(.*?)&lt;\\/h4&gt;.*?\"address&gt;[ \\s]*(.*?)&lt;.*?zip&gt;.*?(\\d{5,5}), US&lt;"; NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionDotMatchesLineSeparators error:&amp;error]; __block NSUInteger counter = 0; // the application hangs on the next line after 1-2 times through [regex enumerateMatchesInString:result options:0 range:NSMakeRange(0, [result length]) usingBlock:^(NSTextCheckingResult *match, NSMatchingFlags flags, BOOL *stop){ NSRange range = [match rangeAtIndex:2]; NSString *streetAddress =[result substringWithRange:range]; range = [match rangeAtIndex:3]; NSString *cityStateZip = [result substringWithRange:range]; NSString *address = [NSString stringWithFormat:@"%@ %@", streetAddress, cityStateZip]; EKItemInfo *party = [self addItem:address]; // geocode address and then map it if (++counter &gt; 4) *stop = true; }]; [receivedData release]; [result release]; [connection release]; //alloc'd previously, so release here. } </code></pre> <p>I realize this is going to be difficult/impossible to duplicate, but I was wondering if anyone has run into a similar issue with NSRegularExpression or if there is something obviously wrong here.</p>
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    1. COCan u share HTML being received ?
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    2. COTurns out the HTML returned was actually NOT what I expected when this happens. I will revise the question and post an answer when I have it figured out a bit more, as I am still not clear on why the regex just spins its wheels.
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    3. COso you set a break point in the block and its not executing?
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