Gain insights into regular expressions' utility for text manipulation. Learn about efficient searching and replacing commands to enhance productivity in daily programming tasks.

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Ever wondered how the search or replace button works? They are very useful commands. 

For beginners and professionals alike, we use these commands in our day-to-day work life, at least once a day. This is why I felt the need to build a course that could help you increase your knowledge and save time while working with strings or any sort of text.

The objective of this course is to help you get a strong grip on regular expressions, or in shorthand, regex. Instead of writing repetitive tasks, it mainly focuses on efficient searching in text files.

Regular Expressions for Programmers

Generally, there are two categories of characters.
* **Literal Characters**: A character with the same meaning.
* **Meta Characters**: A character with special meaning.

## Literal character

In a RegEx, the simplest match is a literal match. Literal, as the name suggests, matches two or more objects with exact properties:
* Case sensitive by default.
* "A" matches "A", and "a" matches "a", and so on.
* Consist of `A-Z a-z 0-9 _` (uppercase alphabets, lowercase alphabets, numbers from zero to nine, and underscore).

To match complex text or patterns, we use some special characters. Special characters have different meanings.

* Each character has a special meaning.
* More than one meaning is possible.
* Consists of  `[ ] ( ) { } + - \ * . ^ ! = $ : | ?`


>**Note**: To use meta-characters as literal characters,  use the backslash `\` to escape them. `/\./` now dot will act as a literal character.

Generally, there are two categories of characters.
* **Literal Characters**: A character with the same meaning.
* **Meta Characters**: A character with special meaning.

# Literal character

In a RegEx, the simplest match is a literal match. Literal, as the name suggests, matches two or more objects with exact properties:
* Case sensitive by default.
* "A" matches "A", and "a" matches "a", and so on.
* Consist of `A-Z a-z 0-9 _` (uppercase alphabets, lowercase alphabets, numbers from zero to nine, and underscore).

Learn about the types of characters in RegEx.

Introduction to RegEx

Characters

Character Set

Repetition Character

Grouping and Alteration Character

Anchor Character

Concepts about RegEx

Conclusion

Assessment 1

Category of Characters

Literal character

Meta character