CODEWITHSUNDEEP
pythonregex
Zain Khan
Zain Khan

Reputation: 3793

Regular Expression: Common string validation

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

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

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

Please Help

Upvotes: 1

Views: 1407

Answers (2)

Abhijit
Abhijit

Reputation: 63707

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$%^&#@")
>>>

Upvotes: 3

eumiro
eumiro

Reputation: 212835

You can do this in Python without regular expressions:

if a.isalnum() and a[0].isalpha() and len(filter(str.isdigit, a)) >= 3:
    ...

If according to @Toomai "3 digits" are "at least 3 characters long", then this is what you need:

if a.isalnum() and a[0].isalpha() and len(a) >= 3:
    ...

Upvotes: 6

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