Reverse substring match in jq array

Question

Let's say I have an array from file /some/file.json:

[
    "This.FilE",
    "That.file",
    "Another.FIle"
]

Then I have a string x with value ThiS.FIle.is.HeRe, now I wanted to know whether any of the string in the array matched the substring in x, case-insensitive (true/false result). Is there any clever way to do this with jq one-liner?

pmf · Accepted Answer · 2023-03-14 11:27:53Z

3

Use inside (the reverse operation to contains) on strings with unified case (e.g. ascii_downcase). any will evaluate to true if at least one item matches.

jq --arg x 'ThiS.FIle.is.HeRe' 'any(.[] | ascii_downcase; inside($x | ascii_downcase))'

true

answered Mar 14, 2023 at 11:27

pmf

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4 Comments

0stone0 Over a year ago

This also logs true if it's not in the array?

pmf Over a year ago

@0stone0 No, any defaults to false. See jq -n '[] | any'

pmf Over a year ago

@0stone0 That's correct. IIUC, true is the correct answer, as "This.FilE" is a (case-insensitive) part of "ThiS.FIle.is.HeRe".

0stone0 Over a year ago

Ahhh, didn't notices the substring, i'll get some coffee, thanks

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