From: Lucky Nl <lists@...>
Date: 2012-04-15T18:42:42+09:00
Subject: Re: how to avoid escaping special chars after backslah in string

Now am using regular expression

" \*\imp ".match(/ 
[|@|#|$|+|{|}|'|"|?|<|>|*|-|!|%|^|&|:|;|\|=|.|~|`|^|\]|\[|'|\\|\/|\|]imp 
/)


It is satisfying coniditions which i was expected .It will not return 
substring match except around specialchar.Am expecting to allow word 
only when it has single specialchar around that.But this is failing when 
string contains \


Jan E. wrote in post #1056404:
> Well, you cannot change the fact that backslashes are escape characters
> in string literals (unless you modified the Ruby Parser). You either
> have to double them or use the heredoc syntax mentioned by Vladimir.
>
> But does this situation even occur? I mean: In you final program, you
> probably won't type in the strings by hand but rather read them from a
> file or whatever. In this case, there's no problem at all. A backslash
> in a given string is a literal backslash. The escaping only happens with
> string literals written in Ruby.
>
> By the way: Your regex doesn't work anyway, because you're only checking
> for substrings. The "false alarm" has nothing to do with the double
> backslash:
>
> " ****imp" => this also matches, because it contains the substring
> "*img".
>
> Also the "|" are wrong in a character class. Why don't you use the regex
> we proposed in your other threads?

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