Regex - Check if multiple patterns apply to string-CodePudding

I have a set of patterns and I want to check if all of them apply to at least one character in a string. The patterns I am using are: [a-z],[A-Z],[0-9] and [^a-zA-Z0-9- ]. I plan to assemble these into a basic if statement such as:

If ((pattern1,pattern2,pattern3).test(string) == true) {
    //Do Something
}

For example, if I were to use the string dA2#, it would return true since all of the patterns apply to the string, however, if I were to use the string svI2, it would return false since only 3 of the 4 patterns apply.

Please keep in mind that I am new to regex and am not fully familiar with how all of the operators work.

CodePudding user response：

Use this: (?=.*[a-z]). String multiple together like this: (?=.*[a-z])(?=.*[A-Z])

check("aBcD123")
check("&Aa1")

function check (string) {
  if (/(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[^a-zA-Z0-9- ])/.test(string)) {
    console.log("matches", string)
  } else {
    console.log("does not match", string)
  }
}

CodePudding user response：

You can do it with the function every:

The every() method tests whether all elements in the array pass the test implemented by the provided function. It returns a Boolean value.

Array.prototype.every()

In our case, it will look like this:

const patterns = [
  ".*[a-z]",
  ".*[A-Z]",
  ".*[0-9]",
  ".*[^a-zA-Z0-9- ]"
]

const check = (source, patterns) =>
  patterns.every(pattern => new RegExp(pattern).test(source));

console.log("dA2#", check("dA2#", patterns))
console.log("svI2", check("svI2", patterns))
console.log("aBcD123", check("aBcD123", patterns))
console.log("&Aa1", check("&Aa1", patterns))