Regular expression to extract words from string

Question

I have a string as

str= "value 1 then perform certain action"

I need a regular expression that will make sure value and perform are present in string without being repeated.

Answer 1

no need regular expression for this simple task. use this code

str= "value 1 then perform certain action"
var a = str.match("value") || []
var b = str.match("perform") || []
if(a.length == 1 && b.length == 1){
    console.log("true")
}else{
    console.log("false")
}

Answer 2

您可以按如下方式设置模式：

pattern: "value (.*) perform (.*)"