Xtext - Check whether string is URL

问题

I'm completely new to Xtext so thanks in advance for your help.

I have the following:

terminal PATTERN_SRC : STRING '.png';
Pattern: name='pattern:' value=PATTERN_SRC;

I want the user to code it like this:

pattern: (URL to image ending with .png / .jpg / .gif)

Currently I'm checking it like this but this does not work.

Is there a nice way to solve this? Thanks in advance!

回答1:

Sone remarks:

Don't use the feature name. This is a reserved keyword for calculating unique names of an element in a resource.

STRING is like this: "Sometext". So what you want is "somefile.png" What you described is "somefile".png You could just use STRING and implement a validation rule to ensure your URL is valid.

来源：https://stackoverflow.com/questions/58957140/xtext-check-whether-string-is-url