specification

import re
re.findall(needle,haystack)

def t_LANGLESLASH(token):
    r'
def t_NUMBER(token):
	r"[0-9]+"
	token.value = int(token.value)
	return token

def t_STRING(token):
    r'"[^"]*"'
    return token

def t_WORD(token):
    r'[^ <>]+'
    return token

def t_IDENTIFIER(token):
    r'[a-zA-Z][a-zA-Z_]*'
    return token

def t_NUMBER(token):
    r'-?[0-9]+(:?\.[0-9]*)'   
    return token