Regex and Fixed Strings

rg 'warn|error' logs/

# Search for either of two words.

rg '\bselect\b' docs/

# Avoid partial matches inside larger identifiers.

rg '\b\d{3}\b' .

# Find three-digit numeric sequences.

rg '(GET|POST|PUT|DELETE) /api/' server.log

# Group pieces of a regex for readability or PCRE2 replacements.

rg -v '^#' .env.example

# Return the lines that do not match the pattern.

rg -F 'user.name' .

# Disable regex parsing and match the text exactly.

rg -F -e 'panic!' -e 'unwrap()' src/

# Provide multiple literal patterns in one command.

rg 'config\.json' .

# Search for a literal dot while staying in regex mode.

rg -Pzo 'BEGIN.*?END' notes.txt

# Match text spanning lines using a more powerful regex engine.

rg -F -f patterns.txt src/

# Supply many search terms from a separate file.

rg -P '(?<=Authorization: )Bearer\s+\S+' headers.txt

# Turn on advanced regex features such as look-around.

rg -P '\b(\w+)\s+\1\b' notes.txt

# Match repeated text with PCRE2.

rg -P 'token(?==)' .env

# Match only when text is followed by another fragment.

rg '\p{L}+' docs/

# Search for letters with Unicode-aware semantics.

rg -U 'foo
bar' sample.txt

# Allow regexes to match newlines.