CODEWITHSUNDEEP
iosregexnsregularexpression
mm24
mm24

Reputation: 9586

Unable to match entire regex

I would like to know whether or not a certain string has a regex.

I wrote the code below which in order to match strings similar to the following:

"A|3|a3\n"

However the code below gets an array of matches. I do not want that as I want to simply understand whether or not my response string matches the criteria given by the regex. Any suggestion on how to do so?

    NSString * response = "A|3|a3\n";
    NSRange   searchedRange = NSMakeRange(0, [ response length]);
    NSString *pattern = @"[ABC]\|[0-9]\|[a][0-9]$";
    NSError  *error = nil;

    NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern: pattern options:0 error:&error];
    NSArray* matches = [regex matchesInString:response options:0 range: searchedRange];
    for (NSTextCheckingResult* match in matches){
    NSString* matchText = [response substringWithRange:[match range]];
    NSLog(@"match: %@", matchText);
}

Upvotes: 0

Views: 58

Answers (2)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626738

I think you are looking for a kind of an IsMatch() function. Here is an example:

NSRange matchRange = [regex rangeOfFirstMatchInString:response options:NSMatchingReportProgress range:searchedRange];

BOOL isFound = NO;
// Did we find a matching range
if (matchRange.location != NSNotFound)
    isFound = YES;

Upvotes: 0

Larme
Larme

Reputation: 26026

Xcode should throw an warning:

Warning: Unknown escape sequence '\|'

for this line:

NSString *pattern = @"[ABC]\|[0-9]\|[a][0-9]$";

"\" escape indeed the next character (to some special signification, like the classical "\n"), but "\|" is a unknown escape sequence for a normal string. So you have to "double it":

NSString *pattern = @"[ABC]\\|[0-9]\\|[a][0-9]$"

Upvotes: 1

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