Regular expression for separating words by uppercase letters and numbers

I was wondering if anyone might know what the regular expression would be to turn this:

West4thStreet

into this:

West 4th Street

I'm going t开发者_如何转开发o add the spaces to the string in Objective-C.

Thanks!

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I don't know exactly where you want to put in spaces, but try something like [a-z.-][^a-z .-] and then put a space between the two characters in each match.

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Something like this perl regex substitution would put a space before each group of capital letters or numbers. (You'd want to trim space before the string in this case also.) I assume you don't want it to break up eg: 45thStreet to 4 5th Street

Letters I'm less certain of.

s/([A-Z]+|[0-9]+)/ \1/g

I created a pattern to not match the beginning of the line for my personal amusement:

s/([^\^])([A-Z]+|[0-9]+)/\1 \2/g

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This should work, if all your strings truly match the format of your example:

([A-Z][a-z]+)(\d+[a-z]+)([A-Z][a-z]+)

You can then separate the groups with spaces.

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Another option would be to not use RegExKit and use code to loop through each character in the string and insert a space after each capital letter or after first decimal..

NSMutableString *myText2 = [[NSMutableString alloc] initWithString:@"The1stTest"];
bool isNumber=false;
for(int x=myText2.length-1;x>1;x--)
{
    bool isUpperCase = [[NSCharacterSet uppercaseLetterCharacterSet] characterIsMember:[myText2 characterAtIndex:x]];
    bool isLowerCase = [[NSCharacterSet lowercaseLetterCharacterSet] characterIsMember:[myText2 characterAtIndex:x]];
    if([[NSCharacterSet decimalDigitCharacterSet] characterIsMember:[myText2 characterAtIndex:x]])
        isNumber = true;
    if((isUpperCase || isLowerCase) && isNumber)
    {
          [myText2 insertString:@" " atIndex:x+1];
          isNumber=false;
    }
    if(isUpperCase)
        [myText2 insertString:@" " atIndex:x];
}
NSLog(@"%@",myText2);  // Output: "The 1st Test"