Regex Expression 1

[Edge118]

line = line.replaceAll("?/)&+%%!", "********");

I'm having trouble representing ?/)&+%%! as a regex. As is, I am getting the error: Illegal escape characters for the ? and )

Thanks for your help!


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Regards,

Chris

 

[chessbot]

Put backslashes in front of them?

--Chessbot

"So it goes."
Kurt Vonnegut, Slaughterhouse Five

 

[Edge118]

I already tried that and it gives me the same error.

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Regards,

Chris

 

[chessbot]

In perl and javascript, regexp is between foreslashes (/regex/). I don't know about java, but you can try that.

--Chessbot

"So it goes."
Kurt Vonnegut, Slaughterhouse Five

 

[Edge118]

I don't think it's the same situation here.

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Regards,

Chris

 

[stefanwagner]

it's not, but you need doubled escape-sequences.

A special-meaning character like ')' needs to be escaped, when meant as itself.
But java will interpret '\)' the first backslash as escape-character itself, so you have to show java, that '\' itself is meant, so you end up '\\)'.

That's only the beginning.
Think of java-code, which generates intermediate output for javascript, then you have '\\\\)' and now, the javascript will be in a webpage, and show the usage of regexp, so to display 4 '\' you will need: ....?



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[Edge118]

Thanks for your help...here's what I changed it to:

line = line.replaceAll("\\?/\\)&+%%!", "********");

Is that the equivalent to: "?/)&+%%!"

Cause it's not replacing it in my text file. Thanks.

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Regards,

Chris

 

[stefanwagner]

If you don't like to read the (not very lean) javadoc-pages, to find the solution, you make a small test-program:

final String oriLine = "?/)&+%!";
System.out.println (oriLine.replaceAll("\\?", "1"));
System.out.println (oriLine.replaceAll("\\)", "2"));
// ...

And so on.
This way you find very fast (took me 2 mins) which character needs to be escaped.

For later usage, it's good practice, to have a snipplet-template, which creates a testfile, named dynamically, containing a class, a main method and constructor, where you only need to insert your testcode, but which can be saved for later usage.
The dynamic name is important, to store different tests without loosing time, and to work on multiple testings at the same time.

I just called

jtemplate SuspRegex

and could start testing.
You will not believe how many time you save, if you spend it once to generate a template.

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[Edge118]

Thanks for the help. It turns out my problem was I needed "\\" before the "?", ")", AND the "+"

Thanks again!

"Pin me. Perl me."

Regards,

Chris