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

Question

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?

javascript regex

Answer 1

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);
});

Answer 2

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);
});

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

Answer №1

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