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Restricting characters in a quoted string#460

Answeredbyalecramsay
alecramsay asked this question inQ&A
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I have a double- or single-quoted string like this which works great:

string_def: pp.QuotedString = pp.QuotedString(    '"', unquote_results=False) | pp.QuotedString("'", unquote_results=False)

I want to restrict the characters in it, so I replaced it with this:

string: pp.Word = pp.Word(    pp.printables, exclude_chars=meta_chars, min=2, as_keyword=True)double_quoted_string: pp.ParserElement = pp.Combine(    double_quote + string + double_quote)single_quoted_string: pp.ParserElement = pp.Combine(    single_quote + string + single_quote)string_def: pp.ParserElement = (    double_quoted_string | single_quoted_string)

This throws an exception on the same input though.

I'm guessing I'm missing something subtle. Appreciate any tips on how to accomplish the goal.

(Thanks for the wonderful package, Paul!)

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This gave me just enough to go on that I figured out the problem: I wasn't excluding single or double quotes from the word, so my string var was eating them.

This:

quotes: str = "\"'"string: Word = Word(printables, exclude_chars=quotes + meta_chars, min=2)double_quoted_string: ParserElement = Combine(double_quote + string + double_quote)single_quoted_string: ParserElement = Combine(single_quote + string + single_quote)string_def: ParserElement = double_quoted_string | single_quoted_string

is how to replace this and only include printable characters (except quotes and meta characters):

string_def: QuotedString = QuotedString('"', unquote_results=False) | QuotedString(    "'", unquote…

Replies: 3 comments

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What is in meta_chars? And what is the input that is failing that you expect to succeed?

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If there are spaces in your quoted strings, then the expression you've written won't match them because printables does not include any whitespace characters.

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This gave me just enough to go on that I figured out the problem: I wasn't excluding single or double quotes from the word, so my string var was eating them.

This:

quotes: str = "\"'"string: Word = Word(printables, exclude_chars=quotes + meta_chars, min=2)double_quoted_string: ParserElement = Combine(double_quote + string + double_quote)single_quoted_string: ParserElement = Combine(single_quote + string + single_quote)string_def: ParserElement = double_quoted_string | single_quoted_string

is how to replace this and only include printable characters (except quotes and meta characters):

string_def: QuotedString = QuotedString('"', unquote_results=False) | QuotedString(    "'", unquote_results=False)Thanks again ...
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Answer selected byalecramsay
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