Question

我有以下行，我正在搜索“蓝牙”这个词，现在我想搜索多个字符串，即蓝牙，MAP，FTP ..如何更新正则表达式来执行此操作？

line = 'Bluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.'
m = re.search('\nBluetooth: (.*)\n', line, re.IGNORECASE)

Answer 1

m = re.search('\n(Bluetooth:|MAP|FTP) (.*)\n', line, re.IGNORECASE)有效吗？

编辑：我没有注意到上面的整个示例字符串。现在我开始认为你的意思是你要匹配一个以“蓝牙：”开头的字符串，然后包含“MAP”或“FTP”？

如果是这样的话： \nBluetooth:(.*)(MAP|FTP)(.*)\n

我不明白你究竟想要完成什么。你能解释一下吗？

Answer 2

在re模块中，您可以使用findall方法，该方法将返回匹配字符串列表

import re
line = 'Bluetooth: Merging two BT process into one BT process to reduce memory. This patch     enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.'
m = re.findall('bluetooth|map|ftp', line, re.IGNORECASE)
print m

但是我不确定这是你想要的，因为这也与laster蓝牙相匹配（因为re.ignorecase）。如果您想要区分大小写的搜索，那么这应该有效：

import re
line = 'Bluetooth: Merging two BT process into one BT process to reduce memory. This patch     enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.'
m = re.findall('Bluetooth|MAP|FTP', line)
print m

希望有所帮助。

干杯，

Answer 3

如果你想测试你的模式（蓝牙，MAP，FTP ..）是否存在于多个字符串中你可以使用这个re.search，当它找到匹配时返回值将是MatchObject否则将是没有

re.search('^(Bluetooth|MAP|FTP):.+$', s, re.IGNORECASE|re.M)

如果你想找到符合你模式的所有行，你可以使用

ret = re.findall('^((Bluetooth|MAP|FTP):.+$)', s, re.IGNORECASE|re.M)

或

re.finditer('^((Bluetooth|MAP|FTP):.+$)', s, re.IGNORECASE|re.M)

不同之处在于findall将返回一个元组列表，而finditer将返回一个MatchObject foreach yeild。

以下是根据您的请求提供此方法的三种测试代码

>>> s = '\nBluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.\nBluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.\nBluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.\n\nMerging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.\n'
>>> ret = re.search('^(Bluetooth|MAP|FTP):.+$', s, re.IGNORECASE|re.M)
>>> ret.groups()
('Bluetooth',)
>>> ret = re.findall('^((Bluetooth|MAP|FTP):.+$)', s, re.IGNORECASE|re.M)
>>> ret
[('Bluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.', 'Bluetooth'), ('Bluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.', 'Bluetooth'), ('Bluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.', 'Bluetooth')]
>>> for m in re.finditer('^((Bluetooth|MAP|FTP):.+$)', s, re.IGNORECASE|re.M):
...     if m:
...         print(m.group())
...         
Bluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.
Bluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.
Bluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.
>>> for m in re.finditer('^((Bluetooth|MAP|FTP):.+$)', s, re.IGNORECASE|re.M):
...     if m:
...         print(m.groups())
...         
('Bluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.', 'Bluetooth')
('Bluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.', 'Bluetooth')
('Bluetooth: Merging two BT process into one BT process to reduce memory. This patch enables BTC , MAP , FTP & SAP modules to run in com.android.bluetooth context.', 'Bluetooth')

更新正则表达式以搜索多个字符串

3 个答案: