regex only digits
console.log(`12331: ${/^d+$/.test('12331')}`) // true
console.log(`abc: ${/^d+$/.test('abc')}`) // falseregex only digits
console.log(`12331: ${/^d+$/.test('12331')}`) // true
console.log(`abc: ${/^d+$/.test('abc')}`) // falseregex match any number of digits
For matching an integer number of one single char/digit, specify:
[0-9]
But for matching any number of more than one char/digit; add "+":
[0-9]+
Example for matching hour with minutes of HH:MM format in a file:
grep "[0-9]+:[0-9]+" file.txtCopyright © 2021 Codeinu
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