isAlpha

isAlpha(X)

Return "true" if all characters in the string are alphabets. For null values of the STRING type, return "false".

X is a STRING scalar or vector.

• When X is a scalar, a Boolean scalar is returned.
• When X is a vector, a Boolean vector is returned.
• When X is a table, a table is returned.

isAlpha("hello");
// output: true

isAlpha("hello world");
// output: false

isAlpha("1And1");
// output: false

isAlpha(string());
// output: false