Finding multiple Punctuation marks occurring in a series in a given string using Javascript

Question

I have below strings -

var string1 = "When did Harry meet Sally ???";
var string2 = "When did Harry meet Sally ?$@";
var string3 = "When did Harry meet Sally ?";

I need to report string3 as correct string out of the above options. With

string1.match(/[:!?+\<">'$‘;@€`*&.\\/]{2}/g)

I am able to say string1 is incorrect. How can detect that string2 is incorrect ?

so a valid string should contain less than 3 consecutive puctuations? — RomanPerekhrest
– RomanPerekhrest, Commented Apr 11, 2017 at 9:01
valid string should contain only one punctuation. It is fine if there are multiple punctuation but they should not be in series together. — aks
– aks, Commented Apr 11, 2017 at 9:08
"What a beautiful day!!!" should show as incorrect "What a beautiful day!" should be the correct one. — aks
– aks, Commented Apr 11, 2017 at 9:08

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

You can use positive lookahead to check if current character is a symbol and character following it is also symbol then return false.

Edit1

To handle cases like ? @, you can remove all spaces and then test it. This will not modify original string, and is only used for validation purpose.

Sample

function validateString(str){
  return !/[^a-z0-9](?=[^a-z0-9])/gi.test(str.replace(/\s+/g, ''))
}


var string1 = "When did Harry meet Sally ???";
var string2 = "When did Harry meet Sally ?$@";
var string3 = "When did Harry meet Sally ?";
var string4 = "When did Harry meet Sally ? @";
var string5 = "When did Harry meet Sally ? test";

[string1, string2, string3, string4, string5].forEach(function(s){
  console.log(validateString(s))
})

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Apr 11, 2017 at 9:04

Rajesh Dixit

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1 Comment

aks Over a year ago

What if we have to show var string4 = "When did Harry meet Sally ? @" ; as incorrect ?

brk · Accepted Answer · 2017-04-11 09:11:37Z

1

Push these sting to an array , so that i , they can can be looped, The regex will return the last two characters.

var string1 = "When did Harry meet Sally ???";
var string2 = "When did Harry meet Sally ?$@";
var string3 = "When did Harry meet Sally ?";

var stringArray = [string1,string2,string3]

stringArray.forEach(function(item){
// will get last two characters else null
 var x = item.match(/[:!?+\<">'$‘;@€`*&.\\/]{2}/g);
 // if null then log the string
 x=== null?console.log(item):''
})

answered Apr 11, 2017 at 9:11

brk

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