Try out our new RRULE tool for creating RRULE compatible strings.






Specifies a substring match on a property or parameter value.


The CALDAV for a substring match against the property or parameter value specified in a calendaring REPORT request.

The "collation" attribute is used to select the collation that the server MUST use for character string matching. In the absence of this attribute, the server MUST use the "i;ascii-casemap" collation.

The "negate-condition" attribute is used to indicate that this test returns a match if the text matches when the attribute value is set to "no", or return a match if the text does not match, if the attribute value is set to "yes". For example, this can be used to match components with a STATUS property not set to CANCELLED.


   PCDATA value: string


This document was automatically converted to XHTML using an RFC to HTML converter with the original text document at the Internet Engineering Task Force web site at .  The original text document should be referred to if there are any errors or discrepancies found in this document.

Need to test your iCalendar feeds?

The iCalendar Validator provides developers and testers a method to validate their iCalendar feeds, which can take data from either a URL, file or text snippet and compare it against the RFC 5545 specification.  We believe we have one of the best iCalendar validation tools available on the internet. More information about the validator can be found here.