Radarr/src/NzbDrone.Core/Profiles/Releases/TermMatchers/CaseInsensitiveTermMatcher.cs

namespace NzbDrone.Core.Profiles.Releases.TermMatchers
{
    public sealed class CaseInsensitiveTermMatcher : ITermMatcher
    {
        private readonly string _originalTerm;
        private readonly string _term;

        public CaseInsensitiveTermMatcher(string term)
        {
            _originalTerm = term;
            _term = term.ToLowerInvariant();
        }

        public bool IsMatch(string value)
        {
            return value.ToLowerInvariant().Contains(_term);
        }

        public string MatchingTerm(string value)
        {
            if (value.ToLowerInvariant().Contains(_term))
            {
                return _originalTerm;
            }

            return null;
        }
    }
}