Question

According to http://www.regular-expressions.info,

You can consider \X the Unicode version of the dot in regex engines that use plain ASCII.

Does this mean that it will match any possible Unicode code point?

Answer 1

The site’s description is pretty good:

\X Matches a single Unicode grapheme, whether encoded as a single code point or multiple code points using combining marks. A grapheme most closely resembles the everyday concept of a “character”. \X matches à encoded as U+0061 U+0300, à encoded as U+00E0, ©, etc.

So, the thing that makes it Unicode-aware is that it can match several code points when those combine to a single visible “thing” (grapheme).

See Wikipedia’s page on Combining Characters for more detail, it lists the U+0300 codepoint mentioned above, for instance.