A rough attempt at making a Python syntax colorizer in sed

color_py.sed

#!/bin/sed -f

# operators
#s/\<\(in\|is\)\>\|[][{}():.*\/+-]/\x1b[30;1m&\x1b[0m/g
s/\<\(in\|is\)\>/\x1b[32;1m&\x1b[0m/g

# booleans
s/\<\(and\|not\|or\)\>/\x1b[32m&\x1b[0m/g

# strings
# 36;1 = bright cyan
s/'[^']*'/\x1b[36;1m&\x1b[0m/g
s/"[^"]*"/\x1b[36;1m&\x1b[0m/g

# importing/scoping/naming
# 31 = blue
s/\<\(as\|from\|import\)\>/\x1b[31m&\x1b[0m/g

# definitions
s/\<\(class\|def\|global\|lambda\)\>/\x1b[33;1m&\x1b[0m/g

# flow-control
s/\<\(break\|continue\|elif\|else\|except\|finally\|for\|if\|raise\|return\|try\|while\|with\|yield\)\>/\x1b[1m&\x1b[0m/g

# statements
s/\<\(assert\|del\|exec\|pass\|print\)\>/\x1b[1m&\x1b[0m/g

# comments
s/#.*/\x1b[30;1m&\x1b[0m/g