Different scenarios call for different techniques when it comes to matching text between special characters

I encounter different scenarios where strings are involved. The goal is to extract the text in between the || symbols. If there is only one ||, then the first part should be taken.

For example:

Useless information|| basic information|| advanced information|| super information|| no information

Expected outcome: basic information, advanced information, and super information

Useless information|| basic information|| advanced information|| no information

Expected outcome: basic information and advanced information

Useless information|| basic information|| no information

Expected outcome: basic information

Useless information|| no information

Expected outcome: Usless information

I have experimented with the following regex patterns:

||[^||]*||[^||]*

and also tried:

([^||]*)(?=||)

However, these patterns do not consistently yield the expected results in all scenarios. Is it possible to achieve this extraction using a single regex expression?

javascriptregex

Answer №1

To achieve this task without using a regex, you can utilize the split method in JavaScript by splitting on ||

const strings = [
  "Useless information|| basic information|| advanced information|| super information|| no information",
  "Useless information|| basic information|| advanced information|| no information",
  "Useless information|| basic information|| no information",
  "Useless information|| no information"
];

strings.forEach((s) => {
  let parts = s.split("||");
  let result = [];
  if (parts.length === 2) {
    result.push(parts[0]);
  }
  if (parts.length === 3) {
    result.push(parts[1]);
  }
  if (parts.length > 3) {
    parts.shift();
    parts.pop();
    result = parts;
  }
  console.log(result);
});

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