I am trying to get words from a string dynamically using a pattern. The pattern and input look something like this
var pattern = "hello this is %var% using %var%";
var input = "hello this is nick using javascript";
Now I want to be able to have an array of the variables like this
["nick", "javascript"]
This should do it:
var pattern = "hello this is %var% using %var%";
var input = "hello this is nick using javascript";
var re = new RegExp(pattern.replace(/%var%/g, '([a-z]+)'));
var matches = re.exec(input).slice(1); // <-- ["nick", "javascript"]
The variable re is a RegExp whose pattern is the pattern variable with each instance of %var% replaced with a capturing group of lower case letters (extend if necessary).
matches is then the result of the re regex executed on the input string with the first element removed (which will be the full matching string).
var pattern = "hello this is %var% using %var%";
var input = "hello this is nick using javascript";
var outputArr = [];
pattern.split(" ").forEach(function (e, i){
e === "%var%" ? outputArr.push(input.split(" ")[i]) : "";
});outputArr is the desired array.
for(var i in patternArr) to iterate an array. That is a bad practice because the iteration will also include any enumerable properties of the array object, not only array elements. Use .forEach(), a traditional for (var i = 0; i < patternArr.length; i++) loop or in ES6, you can use for (let item of patternArr).
.forEach()which gives you both the item and the index.
patternis "hello this is %var% using %var%" andinputis "hello this is nick using nick using javascript"?