InfluxDB Docs

strings.isLetter() function

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))