晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/lib64/python2.7/Demo/comparisons/regextest.py
#! /usr/bin/python2.7

# 1)  Regular Expressions Test
#
#     Read a file of (extended per egrep) regular expressions (one per line),
#     and apply those to all files whose names are listed on the command line.
#     Basically, an 'egrep -f' simulator.  Test it with 20 "vt100" patterns
#     against a five /etc/termcap files.  Tests using more elaborate patters
#     would also be interesting.  Your code should not break if given hundreds
#     of regular expressions or binary files to scan.

# This implementation:
# - combines all patterns into a single one using ( ... | ... | ... )
# - reads patterns from stdin, scans files given as command line arguments
# - produces output in the format <file>:<lineno>:<line>
# - is only about 2.5 times as slow as egrep (though I couldn't run
#   Tom's test -- this system, a vanilla SGI, only has /etc/terminfo)

import string
import sys
import re

def main():
    pats = map(chomp, sys.stdin.readlines())
    bigpat = '(' + '|'.join(pats) + ')'
    prog = re.compile(bigpat)

    for file in sys.argv[1:]:
        try:
            fp = open(file, 'r')
        except IOError, msg:
            print "%s: %s" % (file, msg)
            continue
        lineno = 0
        while 1:
            line = fp.readline()
            if not line:
                break
            lineno = lineno + 1
            if prog.search(line):
                print "%s:%s:%s" % (file, lineno, line),

def chomp(s):
    return s.rstrip('\n')

if __name__ == '__main__':
    main()

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