Regex for coercing input for phone number in javascript

Question

I have an input for a phone number in french format The input accepts two kinds of format, so i can input this:

0699999999
+33699999999

no check is done for the length of the number.

The table in database, the field is of varchar 12, i can have shorter input though. The constraints: input contains only digits from 0 to 9, optional '+' sign accepted only if it starts the string, not after.

Currently i am in Angular with a directive, in that directive the heart is this expression :

var transformedInput = inputValue.replace(/[^0-9]/g, '');

i want the optional leading '+' sign, how can i achieve this? thanks.

regex only? it might be simpler to check for + before applying the regex and add it later again — gamliela
– gamliela, Commented Nov 26, 2015 at 7:44
i didn't write the directive and was looking for a similar solution, regex are powerful — Yvon Huynh
– Yvon Huynh, Commented Nov 28, 2015 at 22:01

Sascha · Accepted Answer · 2015-11-26 07:55:40Z

2

You could make the plus sign optional:

if (/\+?\d*/.test(subject)) {
    // Successful match
} else {
    // Match attempt failed
}

subject is the text you want to check. \+ makes the plus sign a literal and the questionmark makes it optional.

If you just want to check wether ther is a plussign drop the questionmark. But if that is your goal don't use a regex. That is too much overhead. Simply get the first charactor of the trimmed string and check for the plus.

edited Nov 26, 2015 at 7:55

answered Nov 26, 2015 at 7:45

Sascha

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Comments

potatopeelings · Accepted Answer · 2015-11-26 07:44:01Z

1

Change it to

var transformedInput = inputValue.replace(/[^0-9\+]/g, '').replace(/(.)\+/g, '$1');

Note - this will NOT add a + unless there is already a + in the input

What it does is

Do not remove the + symbol on the first replace
Remove every + symbol that is preceded by some character on the 2nd replace

answered Nov 26, 2015 at 7:44

potatopeelings

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1 Comment

Yvon Huynh Over a year ago

thanks this worked for me, also to note: since i am using angular, white space is authorized in the input despite regex, unless you add ng-trim="false"

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