Regex only allow alphanumeric

Question

I am trying to do the following with regex...

Only A-Z and 0-9
Not one character in its own
Can not be just numbers on their own
Can be just letters on their own but at least 2 characters

I have this so far http://regex101.com/r/yW1pV8 ...

.*[a-zA-Z]{2,}+.*

This seems to meet my critera except that it doesn't stop me from putting in other charactes such as $ _ ! etc...

Some correct test data is...

579 International Road
International Road

Some incorrect data is...

679
3
$£
A

Where am I going wrong?

Your example has no test data.......

scrowler
– scrowler

2014-04-02 00:33:16 +00:00
Commented Apr 2, 2014 at 0:33 — scrowler
– scrowler, Commented Apr 2, 2014 at 0:33

arshajii · Accepted Answer · 2014-04-02 00:41:14Z

10

.* matches anything, which isn't what you want it seems. Also, you don't need the +, since X{n,} already means X at least n times. Lastly, you forgot the 0-9 part. So it looks like this will do:

[a-zA-Z0-9]{2,}

Some regex flavors have [a-zA-Z0-9] as a pre-defined character class. For example, in Java it's \p{Alnum}.

If you also want to allow for spaces (as per your test data), use \s:

(?:\s*[a-zA-Z0-9]{2,}\s*)*

edited Apr 2, 2014 at 0:41

answered Apr 2, 2014 at 0:34

arshajii

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6 Comments

fightstarr20 Over a year ago

That doesnt work for me with my test data, I have updated the original post with this data

arshajii Over a year ago

@fightstarr20 Looks like you also want to allow for spaces. See the edit.

fightstarr20 Over a year ago

Yeah just spotted that, was missing the space! This now works better but does still allow numbers to be on their own

fightstarr20 Over a year ago

Plus, now the space counts as a character

arshajii Over a year ago

@fightstarr20 Ok, I'm starting to understand the requirements. Try the edit.

|

muru · Accepted Answer · 2017-03-08 06:05:40Z

0

var pattern = new RegExp(/^(?=.*\d)(?=.*[a-zA-Z]).{2,}$/);
alert(pattern.test(value) + value);

For alpha number

edited Mar 8, 2017 at 6:05

muru

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answered Apr 19, 2016 at 8:10

Vivek Chaudhary

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