Add support for XPATH replace in JCR (Jackrabbit Oak)

I'm trying to determine if there's a way to create a custom Predicate to handle searches for text that contains accented characters.

The problem I am trying to solve is that I have the string "Montréal" stored in the JCR, and want it to show up if my query contains a search for "Montreal" or even "Montre".

I am trying to use the XPATH function fn:replace to do something like this:

replace('Montréal', '[éè]+', 'e')

Here's an example xpath query (run using the query tool in the CRX/DE):

/jcr:root/content/dam/mysite/en//*
[
(@jcr:primaryType = 'dam:AssetContent' and jcr:like(fn:replace(fn:lower-case(data/master/@city), '[éè]+', 'e'),'%montre%'))
]

However, when I attempt to use it, I get the error:

expected: jcr:like | jcr:contains | jcr:score | xs:dateTime | fn:lower-case | fn:upper-case | fn:name | rep:similar | rep:spellcheck | rep:suggest

Is there some way to enable the replace function?