#
# Pattern matching demo program
#
# Matt Bishop, MHI 289I, Winter 2018
#
import re
import sys

#
# loop until end of file
#
while True:
    #
    # read in the pattern
    #
    try:
        pat = raw_input("Pattern: ")
    except EOFError:
        break
    except Exception as msg:
        print msg
        continue
    #
    # compile the regular expression
    #
    try:
        #pc = re.compile(pat, re.IGNORECASE)
        pc = re.compile(pat)
    except Exception as msg:
        print msg
        continue
    #
    # now loop, matching strings (or not)
    #
    while True:
        #
        # read in a string
        #
        try:
            print "The pattern is:", pat
            text = raw_input("Text to match: ")
        except EOFError:
            sys.exit(0)
        except Exception as msg:
            print msg
            continue
        #
        # now do the matching
        #
        print "Does it match the begining of the string? ",
        m = pc.match(text)
        if m:
            print "Yes"
            print "Here's the string it matched:", m.group()
            print "Here's the character positions it spans:", m.span()
            print "Here's the character position where it begins:", m.start()
            print "Here's the character position where it ends:", m.end()
        else:
            print "No"
        print "Does it match anywhere in the string? ",
        n = pc.search(text)
        if n:
            print "Yes"
            print "Here's the string it matched:", n.group()
            print "Here's the character positions it spans:", n.span()
            print "Here's the character position where it begins:", n.start()
            print "Here's the character position where it ends:", n.end()
        else:
            print "No"
        print "Here are all the matches: ",
        print pc.findall(text)