Question

What is a Regular Expression in Javascript?

Answer 1

A regular expression is a sequence of characters that forms a search pattern. You can use this search pattern for searching data in a text. These can be used to perform all types of text search and text replace operations. Let's see the syntax format now,

/pattern/modifiers;

For example, the regular expression or search pattern with case-insensitive username would be,

/John/i;