javascript：将字符串与占位符匹配

Question

I want to check if my string "Hello my name is Thomas" matches with the string "Hello my name is $". So for me following statement should be true:

"Hello my name is Thomas" == "Hello my name is $"

afterwards i want to extract the $ string something like

function getParam(text, template) {
  returns "Thomas"
}

Do you have any suggestions?

Answer 1

You can create a regex, then retrieve the data using Regex.exec

 const regex = /Hello my name is (.*)/; const ret = regex.exec('Hello my name is thomas'); console.log(ret[1]); 

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When using regex, you can use of https://regex101.com/ . it helps you understand what you are doing.

Example in your case :

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 function extractName(str) { const ret = /Hello my name is (.*)/.exec(str); return (ret && ret[1].trim()) || null; } const name = extractName('Hello my name is thomas'); const nameWithSpace = extractName('Hello my name is thomas '); const fail = extractName('failure'); console.log(name); console.log(nameWithSpace); console.log(fail);