Heads up: problems with github.com/dlclark/regexp2 1.5.0 and later

[jmooring]

Chroma currently uses github.com/dlclark/regexp2 1.4.0, which is fine. At some point in the future, if we bump to 1.5.0 or later, there will be problems.

Highlighting this string with the Go lexer:

xəx := 0

With dlclark/regexp2 1.4.0 (PASS):

<span class="nx">xəx</span>

With dlclark/regexp2 1.5.0 and later (FAIL):

<span class="nx">x</span>
<span class="err">ə</span>
<span class="nx">x</span>

[alecthomas]

Interesting, have you filed a bug with regexp2?

[jmooring]

No.

[alecthomas]

This appears to be because dclark made RE2 compatibility mode (which Chroma uses) stricter. In particular, \w now only matches ASCII words.