regex - Why is my line anchor not functioning as I expected?

I'm trying to parse the location entries from a .ics file as follows seen in the image below . Normally this works fine even though the only tester I can find is PCRE rather than ICU as I just need to add an extra backslash to any special characters.

However in swift I get the following results:

"^Location" //No Match
"^VERSION" //No Match
"^BEGIN" //Match
"^ :" //Match

Can I get the '^' anchors to function like they do in the PCRE tester?

PCRE regex tester

Code

func testParticipantParsing()
{

    //let locationRegex = "^LOCATION:(.*(?:\\n :?.*)*)"
    let locationRegex = "LOCATION:(.*(?:\\n :?.*)*)"
    var regex : NSRegularExpression! = nil
    var resultsArray = [String]()

//Parse for location
    do
    {
        regex = try NSRegularExpression(pattern: locationRegex, options: NSRegularExpressionOptions.init(rawValue: 0))
        let nsString = content as NSString

        let results = regex.matchesInString(content, options: [], range: NSMakeRange(0, nsString.length))
        resultsArray = results.map{ nsString.substringWithRange($0.range) }
    }
    //Catch errors if regex fails
    catch
    {
        print("invalid regex")
    }
    //Strip .ics new line tokens
    for var result in resultsArray

    {
        result = result.stringByReplacingOccurrencesOfString("\n :", withString: "")
        result = result.stringByReplacingOccurrencesOfString("\n ", withString: "")
        print(result)
    }
}

Answer

Just add the (?m) at the start of your pattern.

let locationRegex = "(?m)^LOCATION:(.*(?:\\n :?.*)*)"
                     ^^^^

The (?m) is the inline modifier version of the MULTILINE modifier that forces ^ to match the location at the beginning of a line rather than string (and makes $ match the location at the end of the line, before the newline sequence).

See Table 4: Flag Options:

m flag:
Control the behavior of ^ and $ in a pattern. By default these will only match at the start and end, respectively, of the input text. If this flag is set, ^ and $ will also match at the start and end of each line within the input text.