The technique of using Javascript \x to escape characters is

I've come across a handful of other software programs that feature a similar construct:

let str = '\x32\x20\x60\x78\x6e\x7a\x9c\x89';

As I experimented with the sequence of numbers and letters within the string, trying to extract the desired text, I began to ponder whether there exists a built-in method to decipher the \x escape sequences in a string. Much like how string.toUpperCase() functions in JavaScript. Although my current project involves processing.js, I am open to exploring alternate programming languages if they offer a solution for decoding the ASCII representation of \x.

javascriptstringescapingasciiprocessing

Answer №1

If you need to escape a string, the String.prototype.charCodeAt() method can come in handy.

To revert escaped characters back to their original form, evaluate the code containing the escapes. For strings with literal escapes, utilize String.fromCharCode().

  • For instance, if you have 

    '\x32\x20\x60\x78\x6e\x7a\x9c\x89'
    and desire "2 `xnz", compare them as:

      '\x32\x20\x60\x78\x6e\x7a\x9c\x89' == "2 `xnz"

  • If dealing with 

    '\\x32\\x20\\x60\\x78\\x6e\\x7a\\x9c\\x89'
    – a string representing \x32\x20\x60\x78\x6e\x7a\x9c\x89, transform it by converting each pair of hex digits to decimal using String.prototype.fromCharCode():

      '\\x32\\x20\\x60\\x78\\x6e\\x7a\\x9c\\x89'.replace(/\\x([0-9a-f]{2})/ig, function(_, pair) {
    return String.fromCharCode(parseInt(pair, 16));
  })

    In cases where data safety is assured and speed isn't crucial, consider using eval. Refer to 1.

      eval('"\\x32\\x20\\x60\\x78\\x6e\\x7a\\x9c\\x89"')

    Note how the double quotes are nested inside single quotes around the input string.

    If recognizing that the input is a program from a trusted source, directly utilizing eval will execute the program rather than providing ASCII values.

      eval('\\x32\\x20\\x60\\x78\\x6e\\x7a\\x9c\\x89')

    Keep in mind that the given input isn't a program, causing the eval call to fail.

  • In case you have "2 `xnz" and seek 

    '\x32\x20\x60\x78\x6e\x7a\x9c\x89'
    , use this method:

      "2 `xnz".split('').map(function(e) {
    return '\\x' + e.charCodeAt(0).toString(16);
  }).join('')

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