How to trim string till first alphabet in a alphanumeric string? [closed] - ios

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I have a alpha numeric string as 24 minutes i want to trim it like 24mplease tell me how can i do this ?

Answer 1

try use code in regex:
NSString *string = #"24 minutes";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:#"([0-9]+)[^a-zA-Z]*([a-zA-Z]{1}).*" options:NSRegularExpressionCaseInsensitive error:nil];
NSString *modifiedString = [regex stringByReplacingMatchesInString:string options:0 range:NSMakeRange(0, [string length]) withTemplate:#"$1$2"];
NSLog(#"%#", modifiedString);
output:
24m

Answer 2

You can use the componentsSeparatedByString: and substringToIndex: methods of NSString Class, to achieve the result.
NSString *str = #"24 minutes";
NSArray *components = [str componentsSeparatedByString:#" "];
// Validation to prevent array out of index crash (If input is 24)
if ([components count] >= 2)
{
NSString *secondStr = components[1];
// Validation to prevent crash (If input is 24 )
if (secondStr.length)
{
NSString *shortName = [secondStr substringToIndex:1];
str = [NSString stringWithFormat:#"%#%#",components[0],shortName];
}
}
NSLog(#"%#",str);
This example works with the above string, however you need to take care of different type of inputs. It can fail if there is multiple spaces between those values.

Answer 3

NSString *aString = #"24 minutes"; // can be "1 minute" also.
First divide the string into two components:
Divide it with white space, since your string can contain one or more number also like "1 minute", "24 mintutes".
NSArray *array = [aString componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
array = [array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:#"SELF != ''"]];
NSLog(#"%#",[array objectAtIndex:0]);
Then fetch the first letter of the second component of the string using substringToIndex and finally combine both the strings.
NSString * firstLetter = [[array objectAtIndex:1] substringToIndex:1];
NSString *finalString = [[array objectAtIndex:0] stringByAppendingString:firstLetter];
NSLog(#"%#",finalString);