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I am going to need to replace a dirty string for a clean string:
-(void)setTheFilter:(NSString*)filter
{
[filter retain];
[_theFilter release];
<PSEUDO CODE>
tmp = preg_replace(@"/[0-9]/",@"",filter);
<~PSEUDO CODE>
_theFilter = tmp;
}
This should eliminate all numbers in the filter so that:
@"Import6652"
would yield @"Import"
How can I do it in iOS ?
Thanks!
980
How to use RegEx with . replace in JavaScript. To use RegEx, the first argument of replace will be replaced with regex syntax, for example /regex/ . This syntax serves as a pattern where any parts of the string that match it will be replaced with the new substring.
Press ⌃ ⇧ R to open the Replace in Path dialog. In the top field, enter your search string. In the bottom field, enter your replacement string.
$1 is the first group from your regular expression, $2 is the second. Groups are defined by brackets, so your first group ($1) is whatever is matched by (\d+). You'll need to do some reading up on regular expressions to understand what that matches.
A regex ( also known as regular expressions) is a pattern string. These pattern strings allow you to search specific patterns in documents and to validate email, phone number etc. In iOS and MacOS regex been handled by NSRegularExpression . To know more about NSRegularExpression read apple documentation.
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:
@"([0-9]+)" options:0 error:nil];
[regex replaceMatchesInString:str options:0 range:NSMakeRange(0, [str length]) withTemplate:@""];
Swift
do {
let regex = try NSRegularExpression(pattern: "([0-9]+)", options: NSRegularExpressionOptions.CaseInsensitive)
regex.replaceMatchesInString(str, options: NSMatchingOptions.ReportProgress, range: NSRange(0,str.characters.count), withTemplate: "")
} catch {}
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