Question 34703 in React native Question posted in
The official React Native documentation can be found here.

RegExp Negative Lookbehind workaround for React Native?

I am trying to split sentences with some exceptions to ignore cases like Mr. And Mrs. Etc… And add them to an array.

This worked in vanilla JS for me

/(?<!sMrs)(?<!sMr)(?<!sSr)(.s)|(!s)|(?s)/gm

Unfortunately React Native doesn’t support the negative lookbehind.

Is there another way I can achieve the same result?

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2

Answers


  1. Chosen as BEST ANSWER
    0

    I ended up doing this:

    let str = "Hello Mr. Jackson. How are you doing today?"

let sentences = str
    .replace(
      /(!”s|?”s|.”|!)]s|.)s|?)|!"s|."s|.s|!s|?s|[.?!])s*/g,
      "$1|"
    )
    .split("|")

let arr = []

for (let i = 0; i < sentences.length; i++) {
  if (sentences[i].includes("Mr.") | sentences[i].includes("Mrs.")) {
    arr.push(sentences[i] + " " + sentences[i+1])
    i++
  } else {
    arr.push(sentences[i])
  }
}

console.log(arr)

    If anyone has a more efficient solution, let me know!


  2. 0

    You can create exceptions in the following way:

    let str = "Hello Mr. Jackson. How are you doing today?"
let sentences = str.match(/(?:b(?:Mrs?|Sr).s|[^!?.])+[!?.]?/g).map(x => x.trim())
console.log(sentences)

    The regex (see its online demo) matches

    • (?:b(?:Mrs?|Sr).s|[^!?.])+ – one or more occurrences of
      • b(?:Mrs?|Sr).s – Mr, Mrs or Sr as whole words followed with . and a whitespace char
      • | – or
      • [^!?.] – any single char other than ?, ! and .
    • [!?.]? – an optional !, ? or ..
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