Pseudolocalization fails with exact or offsetting plurals

Describe the bug When using exact or offsetting plurals, pseudolocalization fails with an error: Error: Can't parse message. Please check correct syntax: "{mēśśàĝēśĆōũńţ, ƥĺũŕàĺ, =0 {Ţĥēŕē'ŕē ńō mēśśàĝēś} one {Ţĥēŕē'ś # mēśśàĝē ĩń ŷōũŕ ĩńƀōx} other {Ţĥēŕē'ŕē # mēśśàĝēś ĩń ŷōũŕ ĩńƀōx}}"

To Reproduce

• Enable pseudolocalization in config
• Add exact or offsetting plurals as documented https://lingui.js.org/ref/message-format.html
• Run npm run compile

import { Plural } from "@lingui/macro"

export default function App() {
   return <Plural
          value={messagesCount}
          _0="There're no messages"
          one="There's # message in your inbox"
          other="There're # messages in your inbox"
        />
}

Expected behavior The plural strings are correctly pseudolocalized

Additional context Appears to be similar to #427, the regex for plurals is tricky to get right

• jsLingui version 2.7.4
• Babel version babel-core@7.0.0-bridge.0
• Create React App

[redbugz]

It appears to also fail on DateFormat:

<Trans>
    Last login on <DateFormat value={lastLogin} />.
</Trans>

Now it’s a runtime error:

core.development.js:143 Uncaught TypeError: formatters[type] is not a function
    at ctx (core.development.js:143)
    at LastLoginOnLastLoginDate (messages.js:1)

[tricoder42]

Duplicate of #743