Representation of Return Symbol | \x0a vs. comparisons to alternatives

I am in the process of validating my code.

Here is a regex check without 0xa:

It appears that in some instances where there is a return character, the regex does not match because 0xa denotes the return character.

Now, here is a regex check including 0xa:

As you can see, everything is now accounted for.

To summarize, my .js file contains the following characters:

[\x0a\x20-\x7e]

However, I have some concerns about why it sometimes uses one form of return over another:

\\ the other return character (I have not verified yet)

And at other times, it uses a return like this:

\x0a

For more information:

http://en.wikipedia.org/wiki/ASCII

javascriptregex

Answer №1

It amazed me how the rows seemed to be grouped together, but it actually has to do with the star in your regular expression. Try changing your regexp to [\x20-\x7e]+. By using the plus sign (indicating one or more matches) instead of the star (indicating zero or more matches), I believe you will achieve the desired outcome.

If you want to truly see what is contained within the inputText field on regexpal, simply open the console in your web browser and execute 

document.getElementById('inputText').value.replace(/[^\x20-\x7e]/g,function(a){‌​a = a.charCodeAt(0).toString(16); return '\\u0000'.slice(0,6-a.length) + a;});
to obtain an accurate representation of the string.

For better visibility:

document.getElementById('inputText').value.replace(
  /[^\x20-\x7e]/g,
  function(a){‌
    ​a = a.charCodeAt(0).toString(16);
    return '\\u0000'.slice(0,6-a.length) + a;
  }
);

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