For server-side pattern validation, you can use the IS_MATCH() validator.
For example:
IS_MATCH('[A-F0-9]{11}|[A-F0-9]{14}', strict=True)
That will match from the beginning of the string, and setting strict=True also
requires matching the end of the string (equivalent to adding a "$" to the
end of the regular expression). If you don't want to match the beginning of
the string but instead search for the pattern anywhere in the string, you
can setsearch=True.
Anthony
On Wednesday, April 11, 2012 6:16:52 PM UTC-4, Anthony wrote:
>
> If you want to stick with client side validation, you might also consider
> a Javascript polyfill library like Webshims Lib (
> http://afarkas.github.com/webshim/demos/), which lets you use HTML5
> features in older browsers. Also note that although client-side validation
> improves the user experience, it does not protect against malicious
> attacks, so you may still want some server-side validation in addition.
>
> Anthony
>
> On Wednesday, April 11, 2012 4:21:35 PM UTC-4, RKS wrote:
>>
>> I'm looking to validate all of my forms with HTML5 and the pattern
>> attribute, but as always, nothing is perfect on the internet and I still
>> need a backup to catch those users who do not use HTML5 friendly browsers.
>>
>> I'm having trouble finding exact representations of the regular
>> expressions in the handbook so if you know, I'd appreciate some help. I
>> have written the code in two ways, the HTML way and the HTML helper way
>> (see below) and the HTML5 works and validates in modern browsers except IE
>> as expected but I can't translate them to python.
>>
>> An example, you will see below, is the expression
>> pattern="[A-F0-9]{11}|[A-F0-9]{14}"
>> This effectively forces an input to only contain uppercase letters of A-F
>> and numbers 0-9. It also ensures the length is exactly 11 characters or 14.
>> So how would I use this in web2py? IS_LENGTH seems to accept only a range
>> from my tests and so far I've only found IS_ALPHANUMERIC to control what
>> characters are accepted.
>>
>> Please seem the form below:
>>
>> HTML:
>>
>> <form id="activate_form" method="post" action="">
>> <label for="meid">MSIE/ESN <sup>*</sup></label>
>> <input name="meid" pattern="[A-Fa-f0-9]{11}|[A-Fa-f0-9]{14}"
>> placeholder="MEID/ESN" required />
>> <br />
>> <label for="zip">Zip Code <sup>*</sup></label>
>> <input type="number" name="zip" pattern="{5}" placeholder="Zip
>> Code" required />
>> <br />
>> <br />
>> <br /><br />
>> <input type="button" name="cancel" value="Cancel"
>> onClick="history.go(-1);return true;" />
>> <input type="submit" name="submit" value="Activate" />
>> <p class="small"><sup>*</sup> denotes a required field.
>> </form>
>>
>>
>>
>> HTML Helpers:
>>
>> form=FORM(LABEL('MEID/ESN
>> ',(SPAN('*'))),INPUT(_name='meid',_pattern="[A-F0-9]{11}|[A-F0-9]{14}",_placeholder='MEID/ESN',_required='required',_title="The
>>
>> MEID/ESN number only contains 11 or 13 characters, the letters A-F, and the
>> numbers 0-9.",requires=[IS_LENGTH(11|14),IS_NOT_EMPTY()],
>> _onblur="this.checkValidity();"),BR(),LABEL('ZIP CODE
>> ',(SPAN('*'))),INPUT(_name='zip',_type='number',_pattern="[0-9]{5}",_placeholder='Zip
>>
>> Code',_required='required',_title="We only required the five character zip
>> code.",requires=IS_NOT_EMPTY()),BR(),BR(),BR(),BR(),INPUT(_type='button',_name='cancel',_value='Cancel',_onclick="history.go(-1);return
>>
>> true;"),INPUT(_type='submit',_name='submit',_value='Activate'),_method='post',_id='activate_form')
>> if form.accepts(request,session):
>> response.flash = 'Form accepted'
>> # redirect(URL('next'))
>> elif form.errors:
>> response.flash = 'Form has errors'
>> return dict(form=form)
>>
>>
>>
>> Thanks.
>>
>
