如何解决正则表达式:计算在不同地方发生的次数
正则表达式是否能够匹配可能被其他模式分隔的模式?
例如: Traceback (most recent call last):
File "/usr/local/anaconda3/lib/python3.8/site-packages/tornado/web.py",line 1703,in _execute
result = await result
File "/usr/local/anaconda3/lib/python3.8/site-packages/tornado/gen.py",line 742,in run
yielded = self.gen.throw(*exc_info) # type: ignore
File "/usr/local/anaconda3/lib/python3.8/site-packages/notebook/services/sessions/handlers.py",line 69,in post
model = yield maybe_future(
File "/usr/local/anaconda3/lib/python3.8/site-packages/tornado/gen.py",line 735,in run
value = future.result()
File "/usr/local/anaconda3/lib/python3.8/site-packages/tornado/gen.py",in run
yielded = self.gen.throw(*exc_info) # type: ignore
File "/usr/local/anaconda3/lib/python3.8/site-packages/notebook/services/sessions/sessionmanager.py",line 88,in create_session
kernel_id = yield self.start_kernel_for_session(session_id,path,name,type,kernel_name)
File "/usr/local/anaconda3/lib/python3.8/site-packages/tornado/gen.py",line 100,in start_kernel_for_session
kernel_id = yield maybe_future(
File "/usr/local/anaconda3/lib/python3.8/site-packages/tornado/gen.py",line 209,in wrapper
yielded = next(result)
File "/usr/local/anaconda3/lib/python3.8/site-packages/notebook/services/kernels/kernelmanager.py",line 168,in start_kernel
super(MappingKernelManager,self).start_kernel(**kwargs)
File "/usr/local/anaconda3/lib/python3.8/site-packages/jupyter_client/multikernelmanager.py",line 186,in start_kernel
km.start_kernel(**kwargs)
File "/usr/local/anaconda3/lib/python3.8/site-packages/jupyter_client/manager.py",line 308,in start_kernel
self.kernel = self._launch_kernel(kernel_cmd,**kw)
File "/usr/local/anaconda3/lib/python3.8/site-packages/jupyter_client/manager.py",line 215,in _launch_kernel
return launch_kernel(kernel_cmd,**kw)
File "/usr/local/anaconda3/lib/python3.8/site-packages/jupyter_client/launcher.py",line 135,in launch_kernel
proc = Popen(cmd,**kwargs)
File "/usr/local/anaconda3/lib/python3.8/subprocess.py",line 854,in __init__
self._execute_child(args,executable,preexec_fn,close_fds,File "/usr/local/anaconda3/lib/python3.8/subprocess.py",line 1702,in _execute_child
raise child_exception_type(errno_num,err_msg,err_filename)
FileNotFoundError: [Errno 2] No such file or directory: '/Users/sumeet/miniconda3/bin/python'
将与AAABB匹配。如何使其与ABABA匹配?
这仅是示例,我不是在寻找一种匹配AAABB所有排列的方法,而是要学习一种通用方法。 :-)
解决方法
(?=A{3}B{2})[AB]+
(?= A {3} B {2})-给定字符串的正向超前,以确保我们恰好具有3个A和2个B。如果结果为true,则开始寻找[AB] +。这完全符合AAABB。
https://regex101.com/r/6xcNb7/3
根据要求更新,并且应与其他排列相匹配。
(?=(?:B*A){3}B*$)|(?=(?:A*B){2}A*$)[AB]{5}
,
这可以完成工作:
^(?=(?:B*A){3}B*$)(?=(?:A*B){2}A*$)[AB]{5}$
外植:
^ # beginning of string
(?= # positive lookahead,make sure we have after exactly 3 A:
(?: # non capture group
B* # 0 or more B
A # 1 A
){3} # end group,must appear 3 times
B* # 0 or more B
$ # end of string
) # end of string
(?=(?:A*B){2}A*$) # same explanation as above for exactly 2 B
[AB]{5} # we must have 5 A or B
$ # end of string
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