strings.isUpper() function

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strings.isUpper() tests if a single character string is uppercase.

Function type signature

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Parameters

v

({{< req >}}) Single-character string value to test.

Examples

Filter by columns with single-letter uppercase values

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Input data

_time	*tag	_value
2022-01-01T00:00:00Z	t1	a
2022-01-01T00:01:00Z	t1	B
2022-01-01T00:02:00Z	t1	C
2022-01-01T00:03:00Z	t1	d
2022-01-01T00:04:00Z	t1	e

_time	*tag	_value
2022-01-01T00:00:00Z	t2	F
2022-01-01T00:01:00Z	t2	g
2022-01-01T00:02:00Z	t2	H
2022-01-01T00:03:00Z	t2	i
2022-01-01T00:04:00Z	t2	J

Output data

_time	*tag	_value
2022-01-01T00:01:00Z	t1	B
2022-01-01T00:02:00Z	t1	C

_time	*tag	_value
2022-01-01T00:00:00Z	t2	F
2022-01-01T00:02:00Z	t2	H
2022-01-01T00:04:00Z	t2	J

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