function to check if string has specific alphabet in javascript code example

Example 1: how to check if a string has only alphabets in javascript

if (!/[^a-zA-Z]/.test(word))

Example 2: 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 too

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Javascript Example

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