docs-v2/content/v2.0/reference/flux/stdlib/strings/isletter.md

title	description	aliases	menu	weight	related
strings.isLetter() function	The strings.isLetter() function tests if a single character string is a letter (a-z, A-Z).	/v2.0/reference/flux/functions/strings/isletter/	v2_0_ref name parent strings.isLetter Strings	301	/v2.0/reference/flux/stdlib/strings/isdigit/

The strings.isLetter() function tests if a single character string is a letter (a-z, A-Z).

Output data type: Boolean

import "strings"

strings.isLetter(v: "A")

// returns true

Parameters

v

The single character string to test.

Data type: String

Examples

Filter by columns with single-letter values

import "strings"

data
  |> filter(fn: (r) => strings.isLetter(v: r.serverRef))