[Bug]: Does not honour valid PCRE modifiers

[lonix1]

Version

1.52.0

Steps to reproduce

using System;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Microsoft.Playwright;

class Program
{
    public static async Task Main()
    {
        using var playwright = await Playwright.CreateAsync();
        var browser = await playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions { Headless = true });
        var page = await browser.NewPageAsync();

        // .NET regex with inline (?i)
        var regex = new Regex(@"(?i).+\.css$");

        // Throws: Invalid regular expression: /(?i).+\.css$/: Invalid group
        await page.RouteAsync(regex, route => route.ContinueAsync());

        await browser.CloseAsync();
    }
}

Expected behavior

Playwright.NET should honour the PCRE / .NET regex.

At the very least, i, m and s.

Actual behavior

It doesn't.

Additional context

The regex @"(?i).+\.css$" includes the modifier (?i) which is the same as RegexOptions.IgnoreCase. It is preferable as that is embedded in the regex itself and can be easily transported across system boundaries as a simple string. It is standard PCRE.

JS is not PCRE compliant though, and requires the syntax /.+\.css$/i. For some reason Playwright is extracting the regex from the Regex instance and passing it directly to the browser, without checking for modifiers (and translating them to JS regex).

Environment

- Operating System: Ubuntu 24
- CPU: amd64
- Browser: All
- .NET Version: v8