split text items in an array

I have an array like the following

[
  "First sentence ",
  "Second sentence",
  "Third sentence {variable}",
  "Fourth sentence {variable} with other data {variable2}",
  "Fiftth sentence {variable} with additional data {variable2}",
  "Sixth sentence"
]

I want to split the items in the array with the following conditions

if there is a variable (curly bracket) and there is content after the variable, that line should be split into 2 lines. If there is no content after the variable it can be kept as it is.

For example following is the output i need

[
 "First sentence ",
 "Second sentence",
 "Third sentence {variable}",
 "Fourth sentence {variable}",
 "with other data {variable2}",
 "Fiftth sentence {variable}",
 "with additional data {variable2}",
 "Sixth sentence"
]

What i tried so far is as follows

convertLogicsArray(sentenceArray: string[]): string[] {
    const newSentenceArray: string[] = []
    for (const sentence of sentenceArray) {
      // Split the sentence into two parts at the variable.
      const parts = sentence.split('{', 1)
      // If there is text after the variable, make the sentence two lines.
      if (parts.length === 2) {
        newSentenceArray.push(parts[0])
        newSentenceArray.push(parts[1])
      }
      // Otherwise, leave the sentence as one line.
      else {
        newSentenceArray.push(logic)
      }
    }
    return newSentenceArray
  }

It does not return the exact response i need.

How can i form the array as shown in the question when provided with the original array

>Solution :

Flat-map the array, splitting each entry on a lookbehind regex matching your variable format

const sentenceArray = [
  "First sentence ",
  "Second sentence",
  "Third sentence {variable}",
  "Fourth sentence {variable} with other data {variable2}",
  "Fiftth sentence {variable} with additional data {variable2}",
  "Sixth sentence"
];

const newSentenceArray = sentenceArray.flatMap((str) =>
  str.split(/(?<=\{\w+\})/).map((s) => s.trim()),
);

console.log(newSentenceArray);

I’ve also used String.prototype.trim() to remove the spaces after variables.

Note: Lookbehind doesn’t work in IE or Opera Mini if that matters