Strange bug with regexp validator in all browsers but Chrome

[Blama]

Hi Isomorphic,

please see this sample (v11.1p_2018-04-11) and change the validator in the XML file to

expression="^(?!\s).*(?<!\s)$"/>

This expression should prevent space or tab-letters at beginning and ending of string.

This is working fine in Chromium 65/Win10, but not in FF26/IE11/IE Edge on the same system or on Safari/MacOS.
Here the Developer Console Output of IE Edge (the message is about the quantifier in all browsers):

15:04:45.183:INFO:Log:initialized
15:04:45.596:INFO:Log:isc.Page is loaded
15:04:57.253:MUP8:WARN:Log:SyntaxError: Unexpected quantifier
Stack from error.stack:
SyntaxError: Unexpected quantifier
   at isc.A.$74u.regexp.condition (https://www-demos.smartclient.com/smartclient-11.1/isomorphic/system/modules/ISC_Forms.js?isc_version=v11.1p_2018-04-11.js:1562:302)
   at isc_c_Validator_processValidator (https://www-demos.smartclient.com/smartclient-11.1/isomorphic/system/modules/ISC_Forms.js?isc_version=v11.1p_2018-04-11.js:1659:53)
   at isc_Canvas_validateField (https://www-demos.smartclient.com/smartclient-11.1/isomorphic/system/modules/ISC_Core.js?isc_version=v11.1p_2018-04-11.js:4188:1)
   at isc_DynamicForm_validate (https://www-demos.smartclient.com/smartclient-11.1/isomorphic/system/modules/ISC_Forms.js?isc_version=v11.1p_2018-04-11.js:511:1)
   at Function code (Function code:1:4)
   at isc_StatefulCanvas_handleActivate (https://www-demos.smartclient.com/smartclient-11.1/isomorphic/system/modules/ISC_Foundation.js?isc_version=v11.1p_2018-04-11.js:235:96)
   at isc_StatefulCanvas_handleClick (https://www-demos.smartclient.com/smartclient-11.1/isomorphic/system/modules/ISC_Foundation.js?isc_version=v11.1p_2018-04-11.js:236:1)
   at isc_c_EventHandler_bubbleEvent (https://www-demos.smartclient.com/smartclient-11.1/isomorphic/system/modules/ISC_Core.js?isc_version=v11.1p_2018-04-11.js:2055:78)
   at isc_c_EventHandler_handleClick (https://www-demos.smartclient.com/smartclient-11.1/isomorphic/system/modules/ISC_Core.js?isc_version=v11.1p_2018-04-11.js:1908:44)
   at isc_c_EventHandler__handleMouseUp (https://www-demos.smartclient.com/smartclient-11.1/isomorphic/system/modules/ISC_Core.js?isc_version=v11.1p_2018-04-11.js:1893:1)

Do you somehow rewrite the Regexp?
For me, it is happening the same way in an editable ListGrid. The validator definition comes from a type.xml-file:

<SimpleType xmlns:fmt="lmscompany/fmt" name="trimmedText" inheritsFrom="text">
    <fmt:bundle basename="com.lmscompany.lms.server.i18n.DSXMLResources-utf8" encoding="utf-8" />
    <validators>
        <validator type="regexp" expression="^(?!\s).*(?&lt;!\s)$">
            <errorMessage><fmt:message key="validatorWhitespaceNotAllowedAtBeginningOrEnd" /></errorMessage> 
        </validator>
    </validators>
</SimpleType>

I'll remove that code for now, but it would be great if you can have a look at this one.

Best regards
Blama

[Isomorphic]

We're not transforming it, but your regexp is being parsed as XML then interpreted as a string, not a regexp literal. You need another backslash in front of the "s"s.

[Blama]

Hi Isomorphic,

sorry, this does not change the outcome in any browser, please try for yourself with this expression:

expression="^(?!\\s).*(?<!\\s)$" />

(same sample, now on v11.1p_2018-04-17)

Best regards
Blama

[Isomorphic]

It appears you are trying to use lookbehind in your regex which is only supported in Chrome 62+.

[Blama]

Hi Isomorphic,

OK, sorry, I did not know nor expect this. It's 2018, but OK, that's the way it is.

For anyone interested, I found those links with the input of Isomorphic: [1], [2].

Thank you & Best regards
Blama

[Blama]

More theory here.

[Blama]

Pretty sure anyone can do it themselves, but this is the lookbehind-free (and therefore faster) equivalent version of the validator.

^\S?$|^\S.*\S$

Best regards
Blama

[Blama]

Hi @all,

this made it as entry to caniuse.com just recently, so even if this (simple) case is now solved otherwise, you can track browser support here.

Best regards
Blama

[Blama]

Hi @all,

Firefox is going to support this as well from version 78 on.

Best regards
Blama