Question

I want to search a pattern in a string. In the below code the pattern string ‘*’ can be any character.

I got this sample code from here, but it’s not working for me.

NSString *string;
NSString *pattern;
NSRegularExpression *regex;


string = @"img=img_1.png or it can be img=img.png";
pattern = @"img=*.png";

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

NSArray *matches = [regex matchesInString:string
                                  options:0
                                    range:NSMakeRange(0, [string length])];

NSLog(@"matches - %@", matches);

for (NSTextCheckingResult *match in matches)
{
    NSRange range = [match rangeAtIndex:1];
    NSLog(@"match: %@", [string substringWithRange:range]);
}

I want the optput string to be img_1.png & img.png

Answer 1

Change your pattern to:

pattern = @"img=(.*?).png";