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Okay, let's dive deep into how to get a string after a specific character (or substring) in various programming languages. We'll cover different approaches, edge cases, and optimizations.

*Understanding the Problem*

The core problem is to extract a portion of a string that begins after a defined delimiter (the character or substring we're searching for). This is a very common task in text processing, data parsing, and string manipulation. For example:

Extracting the file extension from a filename ("document.pdf" - "pdf").
Extracting data after a separator character in a comma-separated value (CSV) file.
Extracting the user ID from an email address ("[email protected]" - "example.com")

*General Approaches*

The fundamental approaches involve:

1. *Finding the Delimiter:* Locate the position of the character or substring you're looking for within the main string. Most languages have functions for this (e.g., `indexOf`, `find`, `strpos`, `search`).
2. *Extracting the Substring:* Once you have the position of the delimiter, you can use string slicing or substring functions to extract the portion of the string starting after the delimiter.
3. *Handling Errors:* Consider what should happen if the delimiter is not found in the string. Do you return an empty string, throw an error, or return the original string?
4. *Handling Multiple Occurrences:* What if the delimiter appears more than once? Do you want the text after the first occurrence, the last occurrence, or do you need to extract all substrings after each occurrence?

*Language-Specific Implementations*

Now, let's look at how to implement this in some popular programming languages. I'll provide explanations, code examples, and considerations for each.

*1. JavaScript*



Explanation:

`indexOf(char)`: Finds the first occurrence of `char` in `str`. Returns -1 if not found.
`lastIndexOf(char)`: Finds the last occurrence of `char` in `str`. Returns -1 i ...

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