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python - 如何使用正则表达式解析 PCI 地址？

问题描述

我正在尝试找到一种可靠的正则表达式模式，用于从sysfs.

例如：

s = "
# total 0
# drwxr-xr-x   7 root root    0 Mar 22 21:30 .
# drwxr-xr-x 121 root root    0 Mar 22 21:27 ..
# drwxr-xr-x   2 root root    0 Mar 22 21:27 0000:13:45.6:pcie001
# drwxr-xr-x   2 root root    0 Mar 22 21:30 0000:12:34.5
# drwxr-xr-x   2 root root    0 Mar 22 21:30 0000:12:34.6
# -r--r--r--   1 root root 4096 Mar 22 21:29 aer_dev_correctable
"
pattern = r'SOME MAGIC'
list_of_addrs = re.findall(pattern, s, re.MULTILINE)

我期望的地方list_of_addrs = ['0000:13:45.6:pcie001', '0000:12:34.5', '0000:12:34.6']

我大致尝试编码为正则表达式的模式是：

# Starts with a set of 4 hex characters, [0-9a-fA-F]
# :
# Set of 2 hex characters
# :
# Set of 2 hex characters
# Set of 1 hex characters
# Until next whitespace

标签： pythonregexpci-e

解决方案

尝试模式r'\b(0{0,4}:\d{2}:\d{2}.\d:?\w*)'

前任：

import re

s = """
# total 0
# drwxr-xr-x   7 root root    0 Mar 22 21:30 .
# drwxr-xr-x 121 root root    0 Mar 22 21:27 ..
# drwxr-xr-x   2 root root    0 Mar 22 21:27 0000:13:45.6:pcie001
# drwxr-xr-x   2 root root    0 Mar 22 21:30 0000:12:34.5
# drwxr-xr-x   2 root root    0 Mar 22 21:30 0000:12:34.6
# -r--r--r--   1 root root 4096 Mar 22 21:29 aer_dev_correctable
"""
pattern = r'\b(0{0,4}:\d{2}:\d{2}.\d:?\w*)'
list_of_addrs = re.findall(pattern, s, re.MULTILINE)
print(list_of_addrs)

输出：

['0000:13:45.6:pcie001', '0000:12:34.5', '0000:12:34.6']

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