Get non-integers from string in javascript

Question

How can I create a regex for that returns true if it has only numbers and '+' basically 0-9 & +. Using javascript or jQuery.

Answer 1

• Regex for plus anywhere: /^[0-9+]+$/
• Regex for plus only infront: /^\+?[0-9]+$/

What it does:

• ^ Matches the beginning of the string
• [0-9+] Matches 0123456789+
• + Matches one or more
• $ Matches the end of the string

Other version:

• \+? Matches zero or one plus signs in the front

Maybe try regexr for future regex development.

How to test in code:

function isOnlyNumber(str) {
  return /^[0-9+]+$/.test(str);
}