Regex match example with some Unity Headless log.

RegexMatchSample.cs

void Main()
{
    var messages = new[] {
        "Invalid VFX Particle System. It is skipped.",
        "WARNING: Shader If subshaders removal was intentional, you may have forgotten turning Fallback off?",
        "WARNING: Shader Did you use #pragma only_renderers and omit this platform?",
        "ERROR: Shader Sniper/InvisibleShadowCasterUniversalRP shader is not supported on this GPU (none of subshaders/fallbacks are suitable)",
        "ERROR: Shader Hidden/Universal Render Pipeline/Foobar shader is not supported on this GPU (none of subshaders/fallbacks are suitable)",
        "WARNING: Shader Unsupported: 'SineVFX/FooEffects/SG/DissolveParticleFlip' - All subshaders removed",
    };
    var regexes = new[] {
        new Regex("^Invalid\\s+VFX\\s+Particle\\s+System\\.", RegexOptions.Compiled),
        new Regex("^\\w+:\\s+Shader\\s+.*", RegexOptions.Compiled),
    };
    
    foreach (var message in messages)
    {
        var matched = false;
        foreach (var regex in regexes)
        {
            matched = regex.IsMatch(message);
            if (matched)
            {
                $"MATCHED: {message} <- `{regex.ToString()}`".Dump();
                break;
            }
        }
        if (!matched)
        {
            $"FAILED: {message}".Dump();
        }
    }
}

// MATCHED: Invalid VFX Particle System. It is skipped. <- `^Invalid\s+VFX\s+Particle\s+System\.`
// MATCHED: WARNING: Shader If subshaders removal was intentional, you may have forgotten turning Fallback off? <- `^\w+:\s+Shader\s+.*`
// MATCHED: WARNING: Shader Did you use #pragma only_renderers and omit this platform? <- `^\w+:\s+Shader\s+.*`
// MATCHED: ERROR: Shader Sniper/InvisibleShadowCasterUniversalRP shader is not supported on this GPU (none of subshaders/fallbacks are suitable) <- `^\w+:\s+Shader\s+.*`
// MATCHED: ERROR: Shader Hidden/Universal Render Pipeline/Foobar shader is not supported on this GPU (none of subshaders/fallbacks are suitable) <- `^\w+:\s+Shader\s+.*`
// MATCHED: WARNING: Shader Unsupported: 'SineVFX/FooEffects/SG/DissolveParticleFlip' - All subshaders removed <- `^\w+:\s+Shader\s+.*`