## Here is a prolog example.

syntax "prolog" "\.pl$"
comment "%"

# Reset everything
color normal ".*"

# Integers and floats
color yellow "(^| |=)[0-9]+\.?[0-9]*"

# Variables
color red "(^|[[:blank:]]|\(|,)[A-Z]+"
color red "(^|[[:blank:]]|\(|,)_[0-9a-zA-Z_]+($|[[:blank:]]|,|\))"

# Anonymous variable '_'
color yellow "(^|[[:blank:]]|\(|,)_($|[[:blank:]]|,|\))"

# Functions
color cyan "(^|[[:blank:]])\w+\("
color normal "\(|\)|\[|\]|,|=|\\="

# Atoms
color green start="\"" end="\""
color green start="'" end="'"

# Comments
color white "(^|[[:blank:]])%.*$"
color white start="^\s*/\*" end="\*/"

# Reminders
color black,yellow "(BUG|DEBUG|FIXME|IDEA|NOTE|REVIEW|TEMP|TODO|WARNING|XXX)"

# Spaces in front of tabs
color ,red " +	+"