// \d	Any digit character
// \w	An alphanumeric character (“word character”)
// \s	Any whitespace character (space, tab, newline, and similar)
// \D	A character that is not a digit
// \W	A nonalphanumeric character
// \S	A nonwhitespace character
// .	Any character except for newline
// /abc/	A sequence of characters
// /[abc]/	Any character from a set of characters
// /[^abc]/	Any character not in a set of characters
// /[0-9]/	Any character in a range of characters
// /x+/	One or more occurrences of the pattern x
// /x+?/	One or more occurrences, nongreedy
// /x*/	Zero or more occurrences
// /x?/	Zero or one occurrence
// /x{2,4}/	Two to four occurrences
// /(abc)/	A group
// /a|b|c/	Any one of several patterns
// /\d/	Any digit character
// /\w/	An alphanumeric character (“word character”)
// /\s/	Any whitespace character
// /./	Any character except newlines
// /\b/	A word boundary
// /^/	Start of input
// /$/	End of input

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: eloquentjavascript.net

Tags: javascript j

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Contributed on Feb 19 2021

Mehedi Islam Ripon

0 Answers Avg Quality 2/10

regex javscript

Comment

======
Match:
======

	[^pe]000 = except p and e everything match
	
	[pe]000	= only match p and e

=======
Ranges:
=======

	[a-z] , [b-h], [start, end]
	
	[a-zA-Z] -  both uppercase, lowercase
	
	[0-9] - 0 to 9 only
	
	but how 11 digits?? not single number??
	
	[0-9]+ - unlimited digits
	
	[0-9]{11} - only 11 digits
	
	[a-z]{11} - 11 letter word
	
	[a-z]{5,8} - 5 chars upto 8 chars
	
	[a-z]{5,} - minimum 5 and unlimited
	

==============
MetaCharacters:
==============
	
	Must have backslash on front otherwise it will behave as char...

	\d - match any digit character (same as [0-9]) 
	\w - match any word character (a-z, A-Z, 0-9 and _ underscores)
	\s - match a whitespace char (spaces, tabs etc)
	\t - match a tab char only
	
	EX:  \d{3}\s\w{5}  -> first 3 numbers then space then 5 word chars
	
==============
Special Characters:
==============	

		+  -> one or more quantifier
	 
        \  ->  escape character or backslash
	
       []  ->   charset
	
       [^] ->	negate
       
       ?   ->   zero or 1     ex: a[a-z]?   must have a after that optional
       
       .   ->  any char except new line   
       			
       			 ex:  car.    carx true not newline char
       			 ex:  .+  any length string
       			 
       *   ->  0 or more bit like +
       
	       		ex: abc\* - now include * aswell for match
       
       examples:
       
       ^\w{5}$ -> must be 5 words for match
       
       			^ -> start
       			$ -> end
	
       (pet|toy|crazy)?rabbit
	
//===============================================================================//
// const reg2 = new RegExp(/[a-z]/,'i')
// const reg = /[a-z]/gi; // g-global, i-insensitive

const patterns = {
  tel: /^\d{11}$/,
  username: /^\w{5,12}$/i,
  pswd: /^[\w@-]{8,20}$/,
  slug: /^[a-z\d-]{8,20}$/,
  // 4 parts of email
  email: /^([a-z\d\.-]+)@([a-z\d-]+)\.([a-z]{2,8})(\.[a-z]{2,8})?$/,
};

const validate = (value, regex) => {
  const reg = regex.test(value);
  if (reg) {
    // add css class 'valid'
    return "Valid";
  } else {
    // add css class 'invalid'
    return "Invalid";
  }
};

validate("admin.fdsfsdfdsf@gmail.com", patterns["email"]);
	
//===============================================================================//

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Nov 02 2022

paramjeetdhiman

0 Answers Avg Quality 2/10

Regular Expression JS

Comment

^               # start of input 
(?=.*?[A-Z])    # Lookahead to make sure there is at least one upper case letter
(?=.*?[a-z])    # Lookahead to make sure there is at least one lower case letter
(?=.*?[0-9])    # Lookahead to make sure there is at least one number
[A-Za-z0-9]{6,} # Make sure there are at least 6 characters of [A-Za-z0-9]
$               # end of input

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: stackoverflow.com

Tags: expression e

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Contributed on Nov 27 2022

Md. Rased Molla

0 Answers Avg Quality 2/10