Regular Expression in JavaScript | JavaScript Operators | @HackVenom1

Published: 23 May 2023
on channel: HackVenom

#HackVenom1 #JavaScriptFullStackCourse2022FromA_Z #javascriptvariable #javascript #javaprogramming #JSoperators #RegularExpression #JavaScript_Regular_Expression
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========== In this video you will learn all Regular Expression in JavaScript ==================

📺 Error Handlings in JavaScript :-

➽ Regular Expression (RegExp) Object: In JavaScript, a regular expression is represented by the RegExp object, which allows the creation and manipulation of regular expressions.

➽ Pattern Matching: Regular expressions are used for pattern matching within strings. They provide a powerful and flexible way to search, match, and manipulate text.

➽ Literal and Constructor Notation: Regular expressions can be created using either literal notation (e.g., /pattern/) or the RegExp constructor (e.g., new RegExp('pattern')).

➽ Metacharacters: Special characters in regular expressions that have a specific meaning. Examples include . (dot) for any character, * (asterisk) for zero or more occurrences, and + (plus) for one or more occurrences.

➽ Character Classes: Groups of characters enclosed in square brackets [] that match any single character within the brackets.

➽ Quantifiers: Specify the number of occurrences of a character or group. Examples include * (zero or more), + (one or more), ? (zero or one), and {n} (exactly n occurrences).

➽ Anchors: Specify the position in the input string where a match must occur. Examples include ^ (start of the string) and $ (end of the string).

➽ Modifiers: Flags that can be added to a regular expression to change its behavior. Common modifiers include i (case-insensitive), g (global, matches all occurrences), and m (multiline).

➽ Capturing Groups: Portions of a regular expression enclosed in parentheses () that capture and remember the matched text. Captured groups can be referenced in replacement patterns or later in the same regular expression.

➽ Non-Capturing Groups: Similar to capturing groups, but the matched text is not remembered. They are specified using (?:...).

➽ Escape Characters: Some characters have special meanings in regular expressions, and to match them literally, they need to be escaped with a backslash \.

➽ Character Escapes: Special sequences, such as \d (digit), \w (word character), and \s (whitespace), that represent common character classes.

➽ Negation: The use of ^ inside a character class to negate it. For example, [^abc] matches any character except 'a', 'b', or 'c'.

➽ Lookahead and Lookbehind Assertions: Special constructs that assert the presence or absence of a pattern ahead or behind the current position without consuming characters.

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