Regular Expression

 regEx

Quantifiers

Metacharacters

Groups

flags

/abdul/	A regular expression
/abdul/i	A case-insensitive regular expression

/g	Perform a global match (find all)

/i	Perform case-insensitive matching

/m	Perform multiline matching

var pattern = /abdul/

text.match(pattern)

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let text = "aaaabb"; 

let result = text.match(/(aa)(bb)/d);

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let text = `Is this

all there

is`

let pattern = /^is/m;

let result = text.match(pattern);

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The "m" modifier specifies a multiline match.

It only affects the behavior of start ^ and end $.

^ specifies a match at the start of a string.

$ specifies a match at the end of a string.

With the "m" set, ^ and $ also match at the beginning and end of each line.

<p>Do a global, case-insensitive, multiline search for "is" at the beginning of each line in a string.</p>

let text = `Is this

all there

is`

let pattern = /^is/gmi;

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<p>The multiline property returns true if the "m" modifier is set, otherwise false:</p>

<p id="demo"></p>

<script>

let text = "Visit W3Schools!";

let pattern = /W3S/gmi;

let result = pattern.multiline;

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Regular Expression Search Methods

text.match(pattern)	The String method match()
text.search(pattern)	The String method search()
pattern.exec(text)	The RexExp method exec()
pattern.test(text)	The RegExp method test()

search() searches a string for a value and returns the position of the first match

match() searches for a match in a string

The test() method returns true if it finds a match, otherwise false.

The exec() method tests for a match in a string