python之在 pyparsing 中使用 escChar 和 escQuote

我正在尝试解析可能包含一些转义字符的字符串，例如 \"\"。例如，

“这是我要解析的‘示例’”

我目前有以下解析规则，但它无法处理转义字符 \" QuotedString('"',multiline=True)

有用于 escChar 和 escQuote 的选项以及用于 QuotedString 类的选项，但我不确定在那里使用什么。

我想做的一个完整例子

def test1(): 
    str_ = QuotedString('"',escChar='\\',multiline=True) 
    decl = (Keyword("FIELD1") + str_ + ';') | \ 
        (Keyword("FIELD2") + str_ + ';')  
    G = OneOrMore(decl) 
 
    s = """ 
FIELD1 "hello world"; 
 
FIELD2 "an example of \"what\" I want to parse"; 
""" 
 
    print G.parseString(s) 
    # Only print ['FIELD1', 'hello \nworld', ';'] 

请您参考如下方法:

QuotedString 的文档字符串给出:

 |  __init__(self, quoteChar, escChar=None, escQuote=None, multiline=False, unquoteResults=True, endQuoteChar=None) 
 |      Defined with the following parameters: 
 |       - quoteChar - string of one or more characters defining the quote delimiting string 
 |       - escChar - character to escape quotes, typically backslash (default=None) 
 |       - escQuote - special quote sequence to escape an embedded quote string (such as SQL's "" to escape an embedded ") (default=None) 
 |       - multiline - boolean indicating whether quotes can span multiple lines (default=False) 
 |       - unquoteResults - boolean indicating whether the matched text should be unquoted (default=True) 
 |       - endQuoteChar - string of one or more characters defining the end of the quote delimited string (default=None => same as quoteChar) 
 |   

一些交互式解释器实验:

>>> import pyparsing 
>>> s = r'''"this is an \"example\" of what I want to parse" ''' 
>>> pyparsing.QuotedString('"').parseString(s) 
(['this is an \\'], {}) 
>>> pyparsing.QuotedString('"', escChar='\\').parseString(s) 
(['this is an "example" of what I want to parse'], {}) 

我不能说所有类的构造函数参数是 100% 完成的，但可能 >90%。