use sed entirely with regex to get the java major version (#1544)

Closes #1543

CHANGELOG.md

@@ -33,6 +33,7 @@ The callback function provided as parameter to the format function is now called
 * When a glob is specified then ensure that it matches files in the current directory and not only in subdirectories of the current directory ([#1533](https://github.com/pinterest/ktlint/issue/1533)).
 * Disable/enable IndentationRule on blocks in middle of file. (`indent`) [#631](https://github.com/pinterest/ktlint/issues/631)
 * Allow usage of letters with diacritics in enum values and filenames (`enum-entry-name-case`, `filename`) ([#1530](https://github.com/pinterest/ktlint/issue/1530)).
+* Fix resolving of Java version when JAVA_TOOL_OPTIONS is set ([#1543](https://github.com/pinterest/ktlint/issues/1543))
 
 ### Changed
 

ktlint/build.gradle.kts

@@ -61,7 +61,7 @@ val shadowJarExecutable by tasks.registering(DefaultTask::class) {
         // Then if that java version is >= 16, we add the --add-opens command
         // X = X=$( [ "$JV" -ge "16" ] && echo "--add-opens java.base/java.lang=ALL-UNNAMED" || echo "")
         // exec java $X -Xmx512m -jar "$0" "$@"
-        execFile.appendText("#!/bin/sh\n\nJV=\$(java -version 2>&1 | head -1 | cut -d'\"' -f2 | sed '/^1\\./s///' | cut -d'.' -f1)\n\nX=\$( [ \"\$JV\" -ge \"16\" ] && echo \"--add-opens java.base/java.lang=ALL-UNNAMED\" || echo \"\")\n\nexec java \$X -Xmx512m -jar \"\$0\" \"\$@\"\n\n")
+        execFile.appendText("#!/bin/sh\n\nJV=\$(java -version 2>&1 | sed -E -n 's/.* version \"([^.-]*).*\".*/\\1/p')\n\nX=\$( [ \"\$JV\" -ge \"16\" ] && echo \"--add-opens java.base/java.lang=ALL-UNNAMED\" || echo \"\")\n\nexec java \$X -Xmx512m -jar \"\$0\" \"\$@\"\n\n")
         execFile.appendBytes(inputs.files.singleFile.readBytes())
         execFile.setExecutable(true, false)
         if (!version.toString().endsWith("SNAPSHOT")) {