! go env -w GO111MODULE=badvalue
stderr 'invalid GO111MODULE value "badvalue"'

# go env -w rejects invalid GOPATH values
! go env -w GOPATH=~/go
stderr 'GOPATH entry cannot start with shell metacharacter'

! go env -w GOPATH=./go
stderr 'GOPATH entry is relative; must be absolute path'

# go env -w rejects invalid GOTMPDIR values
! go env -w GOTMPDIR=x
stderr 'go: GOTMPDIR must be an absolute path'

#   set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#

#   set -- "\${ARGS[@]}" "\$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#

			// or C:\PROGRA~1. Only ~ as a path prefix has meaning to the shell.
			if strings.HasPrefix(p, "~") {
				fmt.Fprintf(os.Stderr, "go: GOPATH entry cannot start with shell metacharacter '~': %q\n", p)
				os.Exit(2)
			}
			if !filepath.IsAbs(p) {
				if cfg.Getenv("GOPATH") == "" {
					// We inferred $GOPATH from $HOME and did a bad job at it.
					// Instead of dying, uninfer it.

		case "", "auto", "on", "off":
		default:
			return fmt.Errorf("invalid %s value %q", key, val)
		}
	case "GOPATH":
		if strings.HasPrefix(val, "~") {
			return fmt.Errorf("GOPATH entry cannot start with shell metacharacter '~': %q", val)
		}
		if !filepath.IsAbs(val) && val != "" {
			return fmt.Errorf("GOPATH entry is relative; must be absolute path: %q", val)
		}
	case "GOMODCACHE":
		if !filepath.IsAbs(val) && val != "" {

	if in == nil || in.MatchType == nil {
		return true
	}

	catchall := false

	switch m := in.MatchType.(type) {
	case *networking.StringMatch_Regex:
		// `*` is NOT a RE2 style regex, it's a metacharacter.
		// It will be translated as present_match, rather than matching "any string".
		// see https://github.com/istio/istio/pull/20629
		catchall = m.Regex == "*"
	}

	return catchall
}

        then:
        destination.toString().contains(/DEFAULT_JVM_OPTS='"-Dfoo=b'"'"'ar baz" "-Xi'"'"''"'"'n'"`"'t"'/)
    }

    def "defaultJvmOpts is expanded properly in unix script -- backslashes and shell metacharacters"() {
        given:
        JavaAppStartScriptGenerationDetails details = createScriptGenerationDetails(['-Dfoo=b\\ar baz', '-Xint$PATH'], 'bin')
        Writer destination = new StringWriter()

        when:

        then:
        destination.toString().contains(/set DEFAULT_JVM_OPTS="-Dfoo=b\"ar baz" "-Xi\"\"nt" "-Xpatho\\\"logical"/)
    }

    def "defaultJvmOpts is expanded properly in windows script -- backslashes and shell metacharacters"() {
        given:
        JavaAppStartScriptGenerationDetails details = createScriptGenerationDetails(['-Dfoo=b\\ar baz', '-Xint%PATH%'], 'bin')
        Writer destination = new StringWriter()

        when:

        assertEquals("2012-05-18T22:44:00Z", extractData.getValues("dcterms:modified")[0]);
        assertEquals("3", extractData.getValues("meta:character-count")[0]);
        assertEquals("じょうたい", extractData.getValues("cp:contentStatus")[0]);
        assertEquals("3", extractData.getValues("meta:character-count-with-spaces")[0]);
        assertEquals("たいとる", extractData.getValues("dc:title")[0]);

		specialBytes[b%16] |= 1 << (b / 16)
	}
}

// QuoteMeta returns a string that escapes all regular expression metacharacters
// inside the argument text; the returned string is a regular expression matching
// the literal text.
func QuoteMeta(s string) string {
	// A byte loop is correct because all metacharacters are ASCII.
	var i int
	for i = 0; i < len(s); i++ {
		if special(s[i]) {
			break
		}
	}