# JavaScript Regular Expressions
A regular Expression is a sequence of characters that forms a search pattern. The search pattern can be used for text search and text replace operations.
● Using String Methods
In JSP, regular expression to search for a match, and returns the position of the match.
The search() method uses an expression to search for a match, and returns the position of the match.
The replace() method returns a modified string where the pattern is replaced.
● Using String search() With a Regular Expression
● Using String search() With String
The search method will also accept a string as search argument. The string argument will be converted to a regular expression.
● Using String replace() With String
The replace() method will also accept a string as search argument.
● Regular Expression Modifiers
Modifiers can be used to perform case-insentive more global searches.
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| https://www.w3schools.com/js/js_regexp.asp |
● Regular Expression Patterns
Brackets are used to find a range of characters.
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| https://www.w3schools.com/js/js_regexp.asp |
Metacharacters are characters with a special meaning.
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| https://www.w3schools.com/js/js_regexp.asp |
Quantifiers define quantities.
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| https://www.w3schools.com/js/js_regexp.asp |
● Using the RegExp Object
In JavaScript, The RegExp Object is a regular expression object with predefined properties and methods.
● Using test()
The test() method is a RegExp expression method.
It searches a string for a pattern, and returns true or false, depending on the result.
The following example searches a string for the character "e".
● Using exec()
The exec() method is a RegExp expression method.It searches a string for a specified pattern, and returns the found text.
If no match is found, it returns null.
The following example searches a string for the character "e".
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