In the mystery genre who are the irregulars?

In the mystery genre, particularly in the context of Sherlock Holmes, the "irregulars" refer to a group of street urchins and outcasts that Holmes employs for information and assistance in his investigations. They are often referred to as the "Baker Street Irregulars," showcasing their loyalty and resourcefulness in navigating the underbelly of London. Their unique insights and ability to blend into the streets provide Holmes with valuable intelligence that aids in solving cases.