var matches = PcreRegex.Matches("(foo) bar (baz) 42", @"\(\w+\)(*SKIP)(*FAIL)|\w+")
                       .Select(m => m.Value)
                       .ToList();
// result: "bar", "42"

var result = PcreRegex.Replace("hello, world!!!", @"\p{P}+", "<$&>");
// result: "hello<,> world<!!!>"

var regex = new PcreRegex(@"(?<=abc)123");
var match = regex.Match("xyzabc12", PcreMatchOptions.PartialSoft);
// result: match.IsPartialMatch == true

const string jsonPattern = @"
    (?(DEFINE)
        # An object is an unordered set of name/value pairs.
        (?<object> \{
            (?: (?&keyvalue) (?: , (?&keyvalue) )* )?
        (?&ws) \} )
        (?<keyvalue>
            (?&ws) (?&string) (?&ws) : (?&value)
        )

        # An array is an ordered collection of values.
        (?<array> \[
            (?: (?&value) (?: , (?&value) )* )?
        (?&ws) \] )

        # A value can be a string in double quotes, or a number,
        # or true or false or null, or an object or an array.
        (?<value> (?&ws)
            (?: (?&string) | (?&number) | (?&object) | (?&array) | true | false | null )
        )

        # A string is a sequence of zero or more Unicode characters,
        # wrapped in double quotes, using backslash escapes.
        (?<string>
            "" (?: [^""\\\p{Cc}]++ | \\u[0-9A-Fa-f]{4} | \\ [""\\/bfnrt] )* ""
            # \p{Cc} matches control characters
        )

        # A number is very much like a C or Java number, except that the octal
        # and hexadecimal formats are not used.
        (?<number>
            -? (?: 0 | [1-9][0-9]* ) (?: \. [0-9]+ )? (?: [Ee] [-+]? [0-9]+ )?
        )

        # Whitespace
        (?<ws> \s*+ )
    )

    \A (?&ws) (?&object) (?&ws) \z
";

var regex = new PcreRegex(jsonPattern, PcreOptions.IgnorePatternWhitespace);

const string subject = @"{
    ""hello"": ""world"",
    ""numbers"": [4, 8, 15, 16, 23, 42],
    ""foo"": null,
    ""bar"": -2.42e+17,
    ""baz"": true
}";

var isValidJson = regex.IsMatch(subject);
// result: true