`rg` cli options

`-F, --fixed-strings`	Fixed String Matches
`-w, --word-regexp`	Word Regexp
`-e, --regexp`	search for pattern, supports multiples
`-t py`	select only python files
`-o`	output only matching part, not full line
`--no-heading`	use with `cut -d : -f 2` to remove filepath
`-f, --file PATTERNFILE`	search for all patterns, one pattern per line
`-s`	case sensitive
`-i`	case insensitive
`-S`	smart case
`-g "/tests/"`	search only tests files with glob
`-g "!/tests/"`	don’t search test files with inverse glob `!`
`--stats`	number of matches, number of line matches
`--sort created/modified`	sort results by file created/modified time
`-p, --pretty`	`rg -p foo \| less`, pipe color to other program

multi lines matching

Find Python Function Definitions and Usages

# this prints Definitions too because I don't know how to ignore lines
# starts with `def`
# 
# [^,] for removing imports

rg --multiline --multiline-dotall 'foo_function_name\(.*?\)[^,]' -g "!**/tests**"

search for different casing

foo_?bar searches for foo_bar, FOO_BAR, FOOBAR, fooBar

it works because

_? means _ is optional, i.e. the searched words can contain 0 or 1 _
The search is case insensitive by default