fix: Emojis in code/syntax

[SystemKeeper]

Swifts .count on String is not equal to Objective-Cs length on NSString.

The count of the characters returned by the count property isn’t always the same as the length property of an NSString that contains the same characters. The length of an NSString is based on the number of 16-bit code units within the string’s UTF-16 representation and not the number of Unicode extended grapheme clusters within the string.

(Ref https://docs.swift.org/swift-book/documentation/the-swift-programming-language/stringsandcharacters/)

Since we use it to build a NSRange, we need to ensure either to use NSStrings length property (unescapedString as NSString).length or use the Swift equivalent unescapedString.utf16.count.