如何使用变量编写此 RegExp /^\s*FirstName\s*$/？ 我想用变量替换 FirstName？

Question

I am trying to write the RegExp that begins with either the space or the word, but I want to pass the word using the variable. Does anyone have idea about this?

Answer 1

Regex express is just a normal string, you can replace the variable with string method and then use it as pattern. For example:

const getPattern = function (placeholder) {
  return new RegExp(`\\s*${placeholder}\\s*$`);
}
const matcher = getPattern('firstName');
console.log(matcher.exec('my firstName '));