How do I escape special characters in an NSString using RegexKitLite?

I’m constructing a regular expression that uses strings input by the user but the strings might contain special characters such as . \ or * and I want those to be treated as literals and not interpreted by their special meanings in the regex. I’ve tried this:

NSString *word = [input stringByReplacingOccurrencesOfRegex:@"(\\P{L})" withString:@"\\$1"];

but the non letter characters are converted to ‘$1’ instead of being prefixed with a backslash. I’ve tried one and three backslashes in the second term but those give me an ‘Unknown escape sequence’ warning in XCode. How can I print a backslash without RegexKitLite thinking that I’m escaping the dollar sign?

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  • Solutions Collect From Internet About “How do I escape special characters in an NSString using RegexKitLite?”

    Write the expression as you normally would and then replace each single backslash with two. Thus