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Editorial Team
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Asked: 2026-05-27T09:39:56+00:00

Let’s assume a valid string consists of some sentences and has a maximum length

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Let’s assume a valid string consists of some sentences and has a maximum length of 10. A sentence ends with a dot and at least one whitespace character.

lol. omg rofl. => lol.

lol. omg. rofl. => lol. omg.

lol. => lol.

lol omg rofl. => no match

Any ideas?

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1 Answer

  1. Editorial Team
    /^.{,8}\. /

    Explanation:

    • ^ matches start of string
    • .{,8} matches up to 8 chars (10 – specified 2 chars)
    • \. matches literal dot and a space

    Edit: Oh, I missed the sentence contains at least 1 space. Hmm, let me think …

    By looking at https://stackoverflow.com/a/1839379/498634 I think the following might work:

    /^(?!.{11,}).* .*\. /
    • ^ start of string
    • (?!.{11,}) negative look-ahead for exclude strings longer than 10
    • .* .* any sequence with at least one space
    • \. literal dot and space
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