Question

I am doing some basic validation. The flow of the program goes like:

• User inputs a string
• Clicks SUBMIT

Now I want to make sure the following rules are fulfilled:

• No spaces
• Must be alphanumeric… no special charatcers! (ie !@#$%^&*)
• Must start with a letter
• Must be at least 3 characters

How can I do this using python/django regular expressions?

Please Help

Answer 1

Try this

re.compile("^[A-Za-z]\w{2,}$")

>>> re.compile("^[A-Za-z]\w{2,}$")
<_sre.SRE_Pattern object at 0x0272C158>
>>> expr=re.compile("^[A-Za-z]\w{2,}$")
>>> expr.match("A12345")
<_sre.SRE_Match object at 0x02721288>
>>> expr.match("A1")
>>> expr.match("1AS")
>>> expr.match("AB1")
<_sre.SRE_Match object at 0x0272E138>
>>> expr.match("ab1")
<_sre.SRE_Match object at 0x02721288>
>>> expr.match("Abhijit$%^&#@")
>>>