Regex to check a substring is having all numeric or not (in Java script)

Question

I am using following code to check first four characters are alphabate or not.

var pattern = new RegExp('^[A-Z]{4}');
if (enteredID.match(pattern))
    isValidAlphabates = true;
else {
    isValidAlphabates = false;

This is working fine; Now I need to check the next 6 characters (of the entered text) need to be only numeric (0 to 9).

I ve the option to use substring or substr method to extract that part & use the regular experssion: ^[0-9]{6}.

But is there a better way to do it, without using the substring method here.

Jamiec · Accepted Answer · 2010-10-21 11:36:11Z

1

To clarify, the ^ means "at the start of the string". So you can combine your two regexes to say "start with four A-Z then have six 6 0-9."

var pattern = new RegExp('^[A-Z]{4}[0-9]{6}');

answered Oct 21, 2010 at 11:36

Jamiec

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Dan Grossman · Accepted Answer · 2010-10-21 11:36:30Z

1

var pattern = new RegExp('^[A-Z]{4}[0-9]{6}');

answered Oct 21, 2010 at 11:36

Dan Grossman

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Michał Niklas · Accepted Answer · 2010-10-21 11:37:18Z

1

var pattern = new RegExp('^[A-Z]{4}[0-9]{6}$');

I added $ that means that checked string must end there.

answered Oct 21, 2010 at 11:37

Michał Niklas

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4 Comments

Biki Over a year ago

Can u please let me know wats might go wrong if we wont use $, as I am not able to find any difference in my dev testing.

Michał Niklas Over a year ago

Without $ it will match ABCD123456abcdef. You can test regexp (Python flavor, but in this simple example it does not matter) on: pythonregex.appspot.com.

Biki Over a year ago

Ok, Then I think $ is not required for my regex. As my input has some more characters left after the above validation done. Wat is the significance of using +$, instead of only $?

Michał Niklas Over a year ago

'+' can be added to previous character/string to show that is there should be at least one such character/string. Look at JavaScript RegExp description: w3schools.com/jsref/jsref_obj_regexp.asp

Catharsis · Accepted Answer · 2010-10-21 11:37:44Z

1

You can check the whole string at once

var pattern = new RegExp('^[A-Z]{4}[0-9]{6}');

answered Oct 21, 2010 at 11:37

Catharsis

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