Script discussed in http://www.littlemustard.com/blog/2011/5/24/triggergreppy.html

triggergreppy

#!/usr/bin/python

import re
import sys
import fileinput

if len(sys.argv) < 4:
	sys.stderr.write("usage: %s <trigger regex> <begin regex> <end regex>\n" % sys.argv[0])
	sys.exit(1)

regex = sys.argv.pop(1)
begin = sys.argv.pop(1)
end   = sys.argv.pop(1)
buf = list()
searching = True

for line in fileinput.input():
	if searching:
		if re.search(begin, line):
			buf = list()
		if re.search(regex, line):
			searching = False
	buf.append(line)
	if not searching:
		if re.search(end, line):
			searching = True
			for item in buf:
				sys.stdout.write(item)
			sys.stdout.write("\n---------------------\n")
			buf = []