Detecting whitespace in Java String regex

Question

I am testing a postcode which should begin with two letters ('U' and 'S'), followed by up to two numbers. This works find but my problem is detecting any white space that may follow this. I do not want to permit any whitespace after these have been input. I have used the following code:

              while(!(postcode.matches("([U][S])([0-9]{1,2})+!(\\s)"))){

The above code seems to allow any white spaces after the permitted string. Any help would be much appreciated, thanks?

Keppil · Accepted Answer · 2015-01-04 00:08:30Z

2

Since you use matches(), there is no need to explicitly check that there are no spaces. If there is something following the number(s) it will not match.

You can simplify your expression a bit though. Just do:

while(!(postcode.matches("US[0-9]{1,2}"))) {

answered Jan 4, 2015 at 0:08

Keppil

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Danny Daglas · Accepted Answer · 2015-01-04 00:06:37Z

1

Anchor it with a $ at the end of the regex may work:

while(!(postcode.matches("([U][S])([0-9]{1,2})+$"))){

answered Jan 4, 2015 at 0:06

Danny Daglas

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2 Comments

Keppil Over a year ago

The $ anchor does nothing when you use matches() here.

Danny Daglas Over a year ago

Rightly so. I just checked the API. Thanks!

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