`incorrect-version` rejects `1.0.0-alpha.1` and `1.0.0+build`, which SemVer defines

incorrect-version reports two version strings that SemVer defines, while telling the author that SemVer is what it wants.

src/main/resources/org/eolang/lints/metas/incorrect-version.xsl:18:

<xsl:if test="$meta-head='version' and not(matches($meta-tail, '^\d+\.\d+\.\d+(-[a-zA-Z0-9-]+)?$|^\d+\.\d+-SNAPSHOT$'))">

and the message it produces:

The format of the +version meta is wrong: <tail> (SemVer expected instead)

Two shapes that SemVer 2.0.0 spells out are refused by that pattern:

The pre-release group is [a-zA-Z0-9-]+, which has no dot in it, so a numbered pre-release such as -alpha.1 or -rc.2 — the form SemVer itself uses in its examples — falls through. Build metadata is not in the pattern at all, in either alternative.

Verified as two packs under incorrect-version, each with defects: 0, both failing on master:

Tests run: 490, Failures: 2
  incorrect-version/probe-semver.yaml
  incorrect-version/probe-build.yaml

while allows-good-versions.yaml beside them keeps passing, so it is these two shapes specifically.

Root cause

The pattern was written from the common cases rather than from the grammar. The second alternative, ^\d+\.\d+-SNAPSHOT$, is a deliberate Maven exception, so the intent is "SemVer, plus the Maven two-part snapshot" — and the first alternative falls short of the SemVer half.

Suggested fix

The official SemVer regular expression, with the Maven alternative kept:

<xsl:if test="$meta-head='version' and not(matches($meta-tail, '^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(-((0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(\.(0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(\+([0-9a-zA-Z-]+(\.[0-9a-zA-Z-]+)*))?$|^\d+\.\d+-SNAPSHOT$'))">

That also starts rejecting a leading zero in a numeric component (01.2.3), which SemVer forbids and the current pattern allows; if that is more strictness than wanted, \d+ in the three places keeps today's behaviour.

Either way the two shapes above deserve packs, so the rule and the standard it names cannot drift apart again.

Start with src/main/resources/org/eolang/lints/metas/incorrect-version.xsl:18 and inspect the two failing packs, incorrect-version/probe-semver.yaml and incorrect-version/probe-build.yaml. Update the version pattern so the reported SemVer shapes are accepted while preserving the Maven SNAPSHOT alternative, then run those packs and confirm allows-good-versions.yaml still passes.