Calender Agenda Regexp

index.py

import re

def time_replace(timeword):
	timestr = timeword.group().lower()
	flag = None
	if 'h' in timestr:
		flag = 1
	elif ':' in timestr:
		flag = 2
	elif 'm' in timestr:
		flag = 3
	elif 'at' in timestr: 
		return "Location"

	if flag == 1:
		hour = timestr.split('h')[0]
		if int(hour) > 12 and int(hour) < 24:
			return str(int(hour) - 12) + ":00 PM"
		elif int(hour) == 24:
			return str(int(hour) - 12) + ":00 AM"
		elif int(hour) == 12:
			return hour + ":00 PM"
		else:
			return hour + ":00 AM"
	elif flag == 2:
		hour, minute = timestr.split(':')
		if int(hour) > 12 and int(hour) < 24:
			return str(int(hour) - 12) + ":" + minute + " PM"
		elif int(hour) == 24:
			return str(int(hour) - 12) + ":" + minute + " AM"
		elif int(hour) == 12:
			return hour + ":" + minute + " PM"
		else:	
			return hour + ":" + minute + " AM"
	elif flag == 3:
		time = re.search(r"\d+(\.\d+)?", timestr).group()
		hour, ampm = time[-2:], timestr[-2:]
		meridiem = " PM" if 'pm' in ampm else " AM"
		return "%s:00%s" % (hour, meridiem)
	else:
		return timestr

#agenda = raw_input("Enter Agenda Message: ")
agenda = """
	---------------------------------------
	8h going swimming with friends
	16H going swimming with friends

	8:00 going swimming with friends
	08:35 going swimming with friends

	8pm going for dinner
	8AM going swimming with friends		
	7PM going for dinner at ahmedabad
	9am going swimming with friends"""

print agenda
print re.sub(r"(\d{1,2}h)|(\d{1,2}:\d{2})|(\d{1,2}(?:am|pm))|((?!\s)at(?=\s))", time_replace, agenda, flags=re.I|re.M)