Is there a Pattern Matching Utility like GREP in Windows?

Question

Is there a similar utility to grep available from the Windows Command Prompt, or is there a third party tool for it?

Answer 1

Update: This wasn't true when the question was originally asked, but now Microsoft lets one Install the Windows Subsystem for Linux, and Windows will then run grep. In PowerShell, run:

Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux