解析text us组合没有返回任何结果

Question

我是pyparsing的新手。我试图解析一些文本，但并不真正了解pyparsing的行为。

from pyparsing import * 

number = Word(nums) 
yearRange = Combine(number+"-"+number) 
copyright = Literal("Copyright (C)")+yearRange+Literal("CA. All Rights Reserved.") 
copyrightCombine = Combine(copyright) 
date = Combine(Word(nums)+"/"+Word(nums)+"/"+Word(nums)) 
time = Combine(Word(nums)+":"+Word(nums)+":"+Word(nums)) 
dateTime = Combine(date+time) 
pageNumber = Suppress(Literal("PAGE"))+number 
pageLine = Word(nums)+"Copyright (C) 1986-2014 CA. All Rights Reserved."+Combine(Word(nums)+"/"+Word(nums)+"/"+Word(nums))+Combine(Word(nums)+":"+Word(nums)+":"+Word(nums))+pageNumber 
pageLine2 = number+copyright+dateTime+pageNumber 
pageLine3 = Word(nums)+copyright+Combine(Word(nums)+"/"+Word(nums)+"/"+Word(nums))+Combine(Word(nums)+":"+Word(nums)+":"+Word(nums))+pageNumber 

test = "1 Copyright (C) 1986-2014 CA. All Rights Reserved.            07/05/17 10:58:56  PAGE 1241" 
print(pageLine.searchString(test)) 
print(copyright.searchString(test)) 
print(copyrightCombine.searchString(test)) 
print(pageLine2.searchString(test)) 
print(pageLine3.searchString(test)) 

输出：

[['1', 'Copyright (C) 1986-2014 CA. All Rights Reserved.', '07/05/17', '10:58:56', '1241']] 
[['Copyright (C)', '1986-2014', 'CA. All Rights Reserved.']] 
[] 
[] 
[['1', 'Copyright (C)', '1986-2014', 'CA. All Rights Reserved.', '07/05/17', '10:58:56', '1241']] 

我想用定义为pageLine2针对某种原因解析器copyrightCombine没有返回任何结果解析器。这似乎是当我试图使用Combine（）时，导致解析无法返回匹配的原因。

Answer 1

我想通过Combine()的工作方式发生的行为。它预计令牌之间不会有任何空格，但可以被覆盖。

根据the documentation：

合并 - 联接所有匹配标记成一个字符串，使用 指定joinString（默认joinString = “”）;预计所有匹配 令牌邻接，而没有中间的空格（可以是 通过指定构造相邻=假覆盖）