What is the best way to divide a string by identifying a specific character that comes after another character?

Question

What is the best way to divide a string by identifying a specific character that comes after another character?

I have a string in the format:

"MyGroup/exercise#324242-BC2_asd213"

How can I extract the portion of the string before -? Specifically, I want to retrieve MyGroup/exercise#324242. It is important to note that the split should occur after the first instance of - following the #, as there may be other instances of - within the string.

"MyTeam/running-marathon#789098"

In this example, the desired output would be MyTeam/running-marathon#567657

My current method:

.substring(0, vfi.lastIndexOf("-"));

However, I am exploring alternative approaches that are anchor with the "#" symbol for greater precision.

typescript string ecmascript-6

Answer 1

Answer №1

To achieve this, you can implement a regular expression:

const regex = /^([^#]+[^-]*).*$/;

function getSubstringBetweenHashAndDash(value: string) {
  return value.replace(regex, '$1');
}

^ indicates the beginning of the string
[^#]+ will match one or more characters that are not #
[^-]* will match zero or more characters other than -
.* will match any character zero or more times
$ denotes the end of the string

The parentheses capture the desired match so that it can be used for replacement (using $1).

Answer 2

To achieve this, you can implement a regular expression:

const regex = /^([^#]+[^-]*).*$/;

function getSubstringBetweenHashAndDash(value: string) {
  return value.replace(regex, '$1');
}

^ indicates the beginning of the string
[^#]+ will match one or more characters that are not #
[^-]* will match zero or more characters other than -
.* will match any character zero or more times
$ denotes the end of the string

The parentheses capture the desired match so that it can be used for replacement (using $1).

What is the best way to divide a string by identifying a specific character that comes after another character?

Answer №1

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