objective c - RegEx for creating hashtag text -


i'm writing iphone can create various tags. tag's format should like this:

#a-z

where first character of tag #, while charaters after # between a-z , a-z. explain how write regex, , if possible how i'd implement nsstring's?

edit:

here's how you'd implement nsstring , nspredicate:

    nsstring *hashtagregex = @"#[a-za-z]+";     nspredicate *hashtagtest = [nspredicate predicatewithformat:@"self matches %@", hashtagregex];      if ([hashtagtest evaluatewithobject:textfield.text] == no) { // not valid hashtag      }

use regular expression:

#[a-za-z]+

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