RegExp Quantifiers

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  • turned_in_notQuantifiers
    • x{N}
    • x{N,}
    • x{N,M}
    • x*
    • x+
    • x?

N : 0 or any positive number
M : any positive number

  • To run below examples, try it inside <script> tag, in a basic html file

x{N}

It matches exactly N sequence of x's

For example : 

var str="good food today";
var pattern=/o{2}/g;
alert(str.match(pattern));
// Output: oo,oo

Matches: good food today


x{N,}

It matches at least N sequence of x's

For example : 

var str="good food today";
var pattern=/o{1,}/g;
alert(str.match(pattern));
// Output: oo,oo,o

Matches: good food today


x{N,M}

It matches N to M sequence of x's and N < M

For example : 

var str="goood food today";
var pattern=/o{1,2}/g;
alert(str.match(pattern));
// Output: oo,o,oo,o

Matches: goood food today


x*

It matches zero or more occurrences of x
same as x{0,}

For example : 

var str="books are goood friend";
var pattern=/o*d/g;
alert(str.match(pattern));
// Output: oood,d

Matches: books are goood friend


x+

It matches at least one x
same as x{1,}

For example : 

var str="goood food today and ?";
var pattern=/o+d/g;
alert(str.match(pattern));
// Output: oood,ood,od

Matches: goood food today and ?


x?

It matches zero or one occurrences of x
same as x{0,1}

For example : 

var str="goood food today and ?";
var pattern=/o?d/g;
alert(str.match(pattern));
// Output: od,od,od,d

Matches: goood food today and ?


Extra info

Works only when they are the end statements

x{N,}? = x{N}
x{N,M}? = x{N}
x{N}? = x{N}
x*? = x{0}
x+? = x{1}
x?? = x{0}

For example : 

var str="dooo dooo do doo";
var pattern=/do{2,}?/g;
alert(str.match(pattern));
// Output: doo,doo,doo

Matches: dooo dooo do doo

  • Note! '?' used to make the minimum possible match

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