My code appears to be having trouble with the functioning of Regex

Question

My code appears to be having trouble with the functioning of Regex

I have a challenge where I need to convert something like "{{John}}" into just "John."

Initially, I am extracting this from a string:

var parameters = content.match(/[{{]+[Aa-Åå]+[}}]/g);

The regular expression is doing its job correctly by parsing the "{}" to identify content within the string.

However, my issue arises when I attempt to remove the "{}" from each "parameter":

for (var i = 0; i < parameters.length; i++) {
    parameters = parameters[i].replace(/[{}]/g, "");
}

Upon alerting "parameters," all I see is the letter "a." I'm puzzled as to what I might be overlooking, as it seems like it should work as intended.

javascript regex

Answer 1

Answer №1

Consider incorporating greedy matching into maque's solution by utilizing the question mark(?).

"{{John}}".replace(/\{\{(.*?)\}\}/g,"$1");

This code effectively captures "John" from the input "{{John}} and Martin}}", preventing it from mistakenly extracting "John}} and Martin".

Answer 2

Consider incorporating greedy matching into maque's solution by utilizing the question mark(?).

"{{John}}".replace(/\{\{(.*?)\}\}/g,"$1");

This code effectively captures "John" from the input "{{John}} and Martin}}", preventing it from mistakenly extracting "John}} and Martin".

Answer 3

Answer №2

To extract the name enclosed in braces and use the first capturing group (m[1]), you can modify your regular expression as follows:

var re = /\{{2}([a-zA-ZÅå]+)\}{2}/g; 
var str = '{{John}}';
 
if ((m = re.exec(str)) !== null) {
  parameter = m[1];
  alert(parameter);
}

If you need to extract multiple {{NAME}}s from a larger string, you can follow the code provided in my earlier comment:

var re = /\{{2}([a-zA-ZÅå]+)\}{2}/g; 
var str = 'My name is {{John}} and {{Vasya}}.';
var arr = [];

while ((m = re.exec(str)) !== null) {
  parameter = m[1];
  arr.push(m[1]);
}

alert(arr);
alert(str.replace(/([a-zA-ZÅå])\}{2}/g,"$1").replace(/\{{2}(?=[a-zA-ZÅå])/g, ""))

I have adjusted the character class to include English letters + Å and å, ensuring compatibility with the specified range of characters. For further reference on character ranges, please visit the ANSI table.

Answer 4

To extract the name enclosed in braces and use the first capturing group (m[1]), you can modify your regular expression as follows:

var re = /\{{2}([a-zA-ZÅå]+)\}{2}/g; 
var str = '{{John}}';
 
if ((m = re.exec(str)) !== null) {
  parameter = m[1];
  alert(parameter);
}

If you need to extract multiple {{NAME}}s from a larger string, you can follow the code provided in my earlier comment:

var re = /\{{2}([a-zA-ZÅå]+)\}{2}/g; 
var str = 'My name is {{John}} and {{Vasya}}.';
var arr = [];

while ((m = re.exec(str)) !== null) {
  parameter = m[1];
  arr.push(m[1]);
}

alert(arr);
alert(str.replace(/([a-zA-ZÅå])\}{2}/g,"$1").replace(/\{{2}(?=[a-zA-ZÅå])/g, ""))

I have adjusted the character class to include English letters + Å and å, ensuring compatibility with the specified range of characters. For further reference on character ranges, please visit the ANSI table.

Answer 5

Answer №3

Here is a simple example:

let text = "{{Alice}} is friends with {{Bob}}";
let result = text.replace(/\{\{(.*)\}\}/g, "$1");
console.log(result);

This code will search for strings enclosed in double curly braces '{{' and '}}', extract the content inside the braces, and output the first match it finds.

Answer 6

Here is a simple example:

let text = "{{Alice}} is friends with {{Bob}}";
let result = text.replace(/\{\{(.*)\}\}/g, "$1");
console.log(result);

This code will search for strings enclosed in double curly braces '{{' and '}}', extract the content inside the braces, and output the first match it finds.

Answer 7

Answer №4

Give this a try:

let parameters = content.replace(/\{\{([a-åA-Å]+)\}\}/g, "$1");

This code snippet provides you with a cleansed string. If you're looking to create an array, you can use the following approach:

let parameters = content.match(/\{\{[a-åA-Å]+\}\}/g);
for (let i = 0, len = parameters.length; i < len; i++) {
    parameters = parameters[i].replace(/\{\{([a-åA-Å]+)\}\}/g, "$1");
}

Answer 8

Give this a try:

let parameters = content.replace(/\{\{([a-åA-Å]+)\}\}/g, "$1");

This code snippet provides you with a cleansed string. If you're looking to create an array, you can use the following approach:

let parameters = content.match(/\{\{[a-åA-Å]+\}\}/g);
for (let i = 0, len = parameters.length; i < len; i++) {
    parameters = parameters[i].replace(/\{\{([a-åA-Å]+)\}\}/g, "$1");
}

My code appears to be having trouble with the functioning of Regex

Answer №1

Answer №2

Answer №3

Answer №4

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