SIFT-TOOL.ORG

Most of the existing tools for searching through large amounts of text are either fast but inflexible (the original grep) or slightly more flexible but slow or complicated to install... sift is an alternative that aims for both speed and flexibility - i.e. adding features while trying to reach (or even surpass) the performance of the original grep... The additional features include gitignore support, conditions (e.g. match A only when preceded by B within X lines) , full multi-core support and multiline matching.