Understanding RegExp Methods in JavaScript

RegExp Methods

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Comprehensive RegExp Reference

Updated July 2025

Below is a list of essential methods and properties associated with JavaScript's RegExp objects, helping developers efficiently utilize regular expressions.

• compile(): Compiles a regular expression. (Deprecated)
• constructor: Returns the function that created the RegExp prototype.
• dotAll: Indicates if the s flag is set in the expression. (Introduced in 2018)
• escape(): Provides a string with special characters escaped. (Introduced in 2025)
• exec(): Produces a result array for matches in a string.
• flags: Returns the modifiers set in the expression. (Introduced in 2015)
• global: Shows true if the g flag is active.
• hasIndices: Displays true if the d flag is set. (Introduced in 2022)
• ignoreCase: Returns true if the i flag is active.
• lastIndex: Determines the index at which to start the next match.
• multiline: Indicates true if the m modifier is applied.
• source: Returns the text of the RegExp pattern.
• sticky: Shows true if the y flag is set. (Introduced in 2015)
• test(): Tests for a match in a string, returning true or false.
• toString(): Returns the string representation of the regular expression.
• unicode: Shows true if the u flag is set. (Introduced in 2018)
• unicodeSets: Indicates true if the v flag is used. (Introduced in 2023)

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RegExp String Methods

These methods allow strings to interact with regular expressions, providing powerful text manipulation capabilities.

• match(regexp): Returns an array of results.
• matchAll(regexp): Provides an iterator of results.
• replace(regexp, s): Produces a new string with replacements.
• replaceAll(regexp, s): Generates a new string with all replacements.
• search(regexp): Returns the index of the first match.
• split(regexp): Divides the string into an array based on the regular expression.

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See Also:

Explore additional resources to deepen your understanding of regular expressions in JavaScript:

• JavaScript RegExp Tutorial
• JavaScript RegExp Flags
• JavaScript RegExp Character Classes
• JavaScript RegExp Meta Characters
• JavaScript RegExp Assertions
• JavaScript RegExp Quantifiers
• JavaScript RegExp Patterns
• JavaScript RegExp Objects