Regular expressions: Difference between revisions

===NSRegularExpression===

{{works with|iOS|4.0+}}

Test

<lang objc>NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"string$"

options:0

error:NULL];

NSString *str = @"I am a string";

if ([regex rangeOfFirstMatchInString:str

options:0

range:NSMakeRange(0, [str length])

].location != NSNotFound) {

NSLog(@"Ends with 'string'");

}</lang>

Loop through matches

<lang objc>for (NSTextCheckingResult *match in [regex matchesInString:str

options:0

range:NSMakeRange(0, [str length])

]) {

// match.range gives the range of the whole match

// [match rangeAtIndex:i] gives the range of the i'th capture group (starting from 1)

}</lang>

Substitute

<lang objc>NSString *orig = @"I am the original string";

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"original"

options:0

error:NULL];

NSString *result = [regex stringByReplacingMatchesInString:orig

options:0

range:NSMakeRange(0, [orig length])

withTemplate:@"modified"];

NSLog(@"%@", result);</lang>