python - Django RegexField Letters and Numbers only -

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i need regexfield in django form accept letters , numbers, , nothing else. i've tried this, didn't work:

myfield = forms.regexfield(label=("my label"), max_length=31, regex=r'[a-za-z0-9]',         error_message = ("this value must contain letters , numbers."),

i not @ using regular expressions. can tell me doing wrong here , how fix it?

regex=r'[a-za-z0-9]',

is 1 letter.

do want more 1 letter? use repeat

regex=r'[a-za-z0-9]+',

there numerous tutorials on regular expressions. please google "regular expression tutorial."


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