Answers for "regex match number with decimal"

decimal regex

decimal regex: ^d*.?d+$

regex for numbers and decimals only

const source = document.getElementById('source');
source.addEventListener('input', allowOnlyNumberAndDecimals);

function allowOnlyNumberAndDecimals(e) {
  let str = e.target.value
  const regExp = /^(d+(.d+)?)$/

  let status = regExp.test(str) ? 'valid' : 'invalid'

  console.log(status + ' : ' + source.value)
}

number between 0 and 5 with decimals regex

[+]?([0-4]*.[0-9]+|[0-5])

Validates a number between 0 and 5 including decimals