docs: document replace() behavior with empty search string

[imilinovic]

Release note

Fixed a crash where replace() would loop and exhaust server memory when the search string was empty; an empty search string now inserts the replacement around every character (e.g. replace("abc", "", "-") → "-a-b-c-"). Documented this behavior on the string functions reference page.

Related product PRs

PRs from product repo this doc page is related to:
memgraph/memgraph#4269

Checklist:

• Add appropriate milestone (current release cycle)
• Add bugfix or feature label, based on the product PR type you're documenting
• Make sure all relevant tech details are documented
  • Update reference pages (e.g. clauses, functions, flags, experimental, monitoring, Cypher differences)
  • Search for the feature you are working on (mentions) and make updates if needed
  • Provide a basic example of usage
  • In case your feature is an Enterprise one, list it under ME page and mark its page with Enterprise (example).
• Check all content with Grammarly
• Perform a self-review of my code
• The build passes locally
• My changes generate no new warnings or errors

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Project	Deployment	Actions	Updated (UTC)
documentation	Ready	Preview, Comment	Jun 15, 2026 8:06am