js problem with assigning the expression result of a regex operation

Let's talk about a JavaScript string scenario:

"h" + "e" + "l" + "l" + "o"

This particular string is extracted from a regex query, enclosed within [..], and here's how I'm isolating it:

var txt = '"blahblahblah["h"+"e"+"l"+"l"+"o"]foobarfoobarr"';
var re = /[^\[\]]+(?=\])/g;
var squareParen = re.exec(txt); // Result stored in squareParen[0]: ' "h" + "e".. etc'

// By assigning the string to a variable, 
// I anticipated seeing its final output when logged
var result = squareParen[0];
console.log (result);

After posing a query here, my test proved that explicitly setting the string led to an expected console output of 'hello'. However, using the regex-assigned output gives me "h" + "e" + "l" + "l" + "o" instead of the combined "hello".

This situation has left me bewildered as to why.

Answer №1

Your result variable is storing a string that appears as:

'"h"+"e"+"l"+"l"+"o"'

This is different from the expression "h"+"e"+"l"+"l"+"o"; the latter is a series of string concatenations that results in the string "hello".

Keep in mind that the output from console.log may not always be precise, as it focuses on aesthetics rather than accuracy.

I am interested to know what your intended goal is with this code.

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