Find any consecutive lowercase or uppercase letter and include one more

Question

Find any consecutive lowercase or uppercase letter and include one more

I have a task in Javascript that I need help with. The goal is to insert a special character between a lowercase and uppercase letter when they are matched together.

For example:

myHouse => my_House
aRandomString => a_Random_String

And so on...

To achieve this, I came up with the following regex pattern:

/([a-z][A-Z](.{0}))+/g

The issue I'm facing is if I use the replace method like this:

"aRandomString".replace(/([a-z][A-Z](.{0}))+/g, '_')

It will result in: _ando_tring

However, I found a solution which involves multiple steps. Is there a simpler way to accomplish this?

var mString = "aRandomString";
var match = mString.match(/([a-z][A-Z](.{0}))+/g, '_')
var save = [...match]
match = match.map(e => [e.slice(0, 1), '_', e.slice(1)].join(''))
save.forEach((s,i) => mString = mString.replace(s, match[i]))
console.log(mString)

javascript regex typescript

Answer 1

Answer №1

A solution is to identify and replace just the lowercase, uppercase pattern you desire with a replacer.

const myString = "aTestStringForMULTIPLEUpperCase";
const updatedString = myString.replace(/[a-z][A-Z]/g, match => `${match[0]}_${match[1]}`);
console.log(updatedString);

Answer 2

A solution is to identify and replace just the lowercase, uppercase pattern you desire with a replacer.

const myString = "aTestStringForMULTIPLEUpperCase";
const updatedString = myString.replace(/[a-z][A-Z]/g, match => `${match[0]}_${match[1]}`);
console.log(updatedString);

Answer 3

Answer №2

For a more inclusive and versatile approach, take into account uppercase boundaries in addition to the traditional lower followed by upper scenario. This method also considers an uppercase letter between two other uppercase letters on one side and a lowercase letter on the other side.

const regXUppecaseBoundaries = (/(?:(?<=[a-z])[A-Z])|(?:(?<=[A-Z])[A-Z](?=[a-z]))/g);

const sampleText = `myHouse aRandomString
aRandomString aTestStringForMULTIPLEUpperCase
myHouse AaAAaTestStringForMULTIPLEUpperCase`;

// Check out the regex101 link for more details: [https://regex101.com/r/OpmSbx/1]
console.log(
  sampleText.replace(regXUppecaseBoundaries, '_$&')
);

.as-console-wrapper { min-height: 100%!important; top: 0; }

Answer 4

For a more inclusive and versatile approach, take into account uppercase boundaries in addition to the traditional lower followed by upper scenario. This method also considers an uppercase letter between two other uppercase letters on one side and a lowercase letter on the other side.

const regXUppecaseBoundaries = (/(?:(?<=[a-z])[A-Z])|(?:(?<=[A-Z])[A-Z](?=[a-z]))/g);

const sampleText = `myHouse aRandomString
aRandomString aTestStringForMULTIPLEUpperCase
myHouse AaAAaTestStringForMULTIPLEUpperCase`;

// Check out the regex101 link for more details: [https://regex101.com/r/OpmSbx/1]
console.log(
  sampleText.replace(regXUppecaseBoundaries, '_$&')
);

.as-console-wrapper { min-height: 100%!important; top: 0; }

Find any consecutive lowercase or uppercase letter and include one more

Answer №1

Answer №2

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