Regexp boundary excluding dots, brackets, etc-CodePudding

I have new RegExp(`\\b${escapedQuery}`, "i") regex to search words boundary , where escapedQuery is escaped value after lodash's escapeRegExp function.

const BRANDS = [
  "Alexander McQueen",
  "Alexandre De Paris",
  "alexander.t",
  "A.W.A.K.E. MODE",
  "alexanderwang.t",
  "MARC JACOBS (THE)"
];

function filter(query) {
  return BRANDS.filter((brand) => {
    const escapedQuery = escapeRegExp(query);
    const re = new RegExp(`\\b${escapedQuery}`, "i");
    return re.test(brand);
  });
}

But if I pass a dot or bracket symbol, then I don't get the value I expected.

console.log(filter("al")); // OK [  "Alexander McQueen",  "Alexandre De Paris",  "alexander.t",  "alexanderwang.t"]
console.log(filter("M")); // OK [  "Alexander McQueen", "A.W.A.K.E. MODE", "MARC JACOBS (THE)"]
console.log(filter(".")); // Expected [""] - Actual ["alexander.t", "A.W.A.K.E. MODE", "alexanderwang.t"]
console.log(filter("(")); // OK [""] 
console.log(filter(")")); // Expected [""] - Actual ["MARC JACOBS (THE)"]

Here is Sandbox to better understanding expected and actual results

What needs to be fixed in the expression so that it returns the expected value?

CodePudding user response：

You can require the first char to be always a word char:

function filter(query) {
    return BRANDS.filter((brand) => {
        const re = new RegExp(`(?=\\w)${query.replace(/[-\/\\^$* ?.()|[\]{}]/g, '\\$&')}`, "i");
        return re.test(brand);
   });
}

See the demo below:

const BRANDS = [
  "Alexander McQueen",
  "Alexandre De Paris",
  "alexander.t",
  "A.W.A.K.E. MODE",
  "alexanderwang.t",
  "MARC JACOBS (THE)"
];

function filter(query) {
  return BRANDS.filter((brand) => {
    const re = new RegExp(`(?=\\w)${query.replace(/[-\/\\^$* ?.()|[\]{}]/g, '\\$&')}`, "i");
    return re.test(brand);
  });
}

console.log(filter("al")); // OK [  "Alexander McQueen",  "Alexandre De Paris",  "alexander.t",  "alexanderwang.t"]
console.log(filter("M")); // OK [  "Alexander McQueen", "A.W.A.K.E. MODE", "MARC JACOBS (THE)"]
console.log(filter(".")); // Expected [""] - Actual ["alexander.t", "A.W.A.K.E. MODE", "alexanderwang.t"]
console.log(filter("(")); // OK [""] 
console.log(filter(")")); // Expected [""] - Actual ["MARC JACOBS (THE)"]