checking if a character is an alphabet in js
function isLetter(str) {
return str.length === 1 && str.match(/[a-z]/i);
}checking if a character is an alphabet in js
function isLetter(str) {
return str.length === 1 && str.match(/[a-z]/i);
}how to check if a string is alphabetic in javascript
function isAlphaOrParen(str) {
return /^[a-zA-Z()]+$/.test(str);
}
/*/^[a-zA-Z()]*$/ - also returns true for an empty string
/^[a-zA-Z()]$/ - only returns true for single characters.
/^[a-zA-Z() ]+$/ - also allows spaces*/
//better regEX to include question marks toojavascript number in alphabet
// converts numbers to spreadsheet letter columns eg. 1 -> A
function numToSSColumn(num){
let s = '', t;
while (num > 0) {
t = (num - 1) % 26;
s = String.fromCharCode(65 + t) + s;
num = (num - t)/26 | 0;
}
return s || undefined;
}
numToSSColumn(0); // undefined
numToSSColumn(1); // A
numToSSColumn(26); // Z
numToSSColumn(-1); // undefined
numToSSColumn(27); // AA
numToSSColumn(475254); // ZZZZcheck for alphabetic string in javascript
function isAlphaOrParen(str) {
return /^[a-zA-Z()]+$/.test(str);
}Copyright © 2021 Codeinu
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