How to Use French Accents in the Calculated Field Names

Requirement:
French language uses many accents (e.g., à, è, ù, ë, ï, ü). We need a way to possibly be able to use these accents in the calculated fields names. Is there a way to achieve our requirement?

Solution:
With JasperReports Server 9.0.0, by default the calculated functions' names cannot contain special characters, and the only allowed special characters are: space and underscore.

To achieve this requirement, we need to update the property Validator.ClientFunctionName in the validation.properties file (<jasperserver-pro>/WEB-INF/classes) as below

Validator.ClientFunctionName=^[^\\s][a-zA-Z0-9\\s_\\p{L}]+$

And the same rule should also be duplicated in the applicationContext-pro-remote-services.xml file (<jasperserver-pro>/WEB-INF/) as it is used for REST API.

<bean id="functionNameRegex" class="java.lang.String">
<constructor-arg value="^[^\\s][a-zA-Z0-9\\s_\\p{L}]+$" /> <!-- pattern to allow function name -->
</bean>

After saving the above changes a server restart would be required for these changes to reflect. And in this way the requirement to use such accents in the calculated field names can be achieved.
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Ref. Case #02277339