ugrep is a drop-in replacement for BSD and GNU grep, but much faster and
with a ton of new features.

This is unlike other popular grep claiming to be "grep alternatives" or
"replacements" when those actually implement incompatible command-line
options and use an incompatible regex matcher, i.e., Perl regex only
versus POSIX BRE (grep) and ERE (egrep) when ugrep supports all regex
modes.

ugrep has full Unicode extended regex pattern syntax with multi-line
pattern matching without any special command-line options.