Pexpect 实例： 使用match 进行正则表达式匹配

#!/usr/bin/env python
#gtalk： xurongzhong#gmail.com

"""This collects filesystem capacity info using the 'df' command. Tuples of
filesystem name and percentage are stored in a list. A simple report is
printed. Filesystems over 95% capacity are highlighted. Note that this does not
parse filesystem names after the first space, so names with spaces in them will
be truncated. This will produce ambiguous results for automount filesystems on
Apple OSX. """

import pexpect

child = pexpect.spawn ('df')

# parse 'df' output into a list.
pattern = "\n(\S+).*?([0-9]+)%"
filesystem_list = []
for dummy in range (0, 1000):
    i = child.expect ([pattern, pexpect.EOF])
    if i == 0:
        filesystem_list.append (child.match.groups())
    else:
        break

# Print report
print
for m in filesystem_list:
    s = "Filesystem %s is at %s%%" % (m[0], m[1])
    # highlight filesystems over 95% capacity
    if int(m[1]) > 95:
        s = '! ' + s
    else:
        s = '  ' + s
    print s

这个是pexpect自带的实例，匹配的时候好像只能一次捕捉一行？
见：
for dummy in range (0, 1000):
    i = child.expect ([pattern, pexpect.EOF])
    if i == 0:
        filesystem_list.append (child.match.groups())
    else:
        break