Assume there is a string "aaaa/{helloworld}/dddd/{good}/ccc",
I want to get an array which contains the variables "helloworld" and "good" which are in braces {}.
Is there a simple way to implement this using regex?
Below function doesn't work:
function parseVar(str) {
var re = /\{.*\}/; // new RegExp('{[.*]}');// /{.*}/;
var m = str.match(re);
console.log(m)
if (m != null) {
console.log((m));
console.log(JSON.stringify(m));
}
}
parseVar("aaaa/{helloworld}/dddd/{good}/ccc");The global flag (g) allow the regex to find more than one match. .* is greedy, meaning it will take up as many characters as possible but you don't want that so you have to use ? which makes it take up as little characters as possible. It is helpful to use regex101 to test regular expressions.
function parseVar(str) {
var re = /\{(.*?)\}/g;
var results = []
var match = re.exec(str);
while (match != null) {
// matched text: match[0]
// match start: match.index
// capturing group n: match[n]
results.push(match[1])
match = re.exec(str);
}
return results
}
var r = parseVar("aaaa/{helloworld}/dddd/{good}/ccc")
document.write(JSON.stringify(r))