Test, validate and match regular expressions
Matches HTML src attributes pointing to image files stored in a Windows-style '_images' directory (backslash-separated path), capturing the full attribute value plus the filename and its extension (jpg, bmp, png, or gif). The case-insensitive and global flags let it find all image occurrences regardless of extension casing. Commonly used for scraping, validating, or rewriting image paths in HTML, especially content authored on Windows systems.