Question 1

What is a regular expression (regex)?

Accepted Answer

A regular expression is a sequence of characters that defines a search pattern. It is used for finding, replacing, and validating text in programming.

Question 2

What do the flags g, i, m mean?

Accepted Answer

g (global) finds all matches, i (case-insensitive) ignores uppercase/lowercase, m (multiline) allows ^ and $ to match the start/end of each line.

Question 3

How do I match special characters?

Accepted Answer

Escape special characters with a backslash: \. for dot, \* for star, \? for question mark, etc.

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