Description

non-BMP CJK characters and IVS are not recognized to CJK now.
.toString and .toRegExp in regexp-util.CharSet generate regexps incompatible with the u flag by default.
We have to pass the "u" argument to make them compatible with u.

https://prettier.io/playground/#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

https://prettier.io/playground/#N4Igxg9gdgLgprEAuEBDABIdW10e79AOlINohgAtuAAu0cVRVUSADQgQAOMAltAM7KioBO-CAHcACgIQ8UqADbDUATx5MARv1RgA1nBgBlVAFs4AGXZQ4yAGayucVeq07dLDWYDmyGPwCudkLYN2Tx8-OAAPFjh+diNYWQAVKKgBdjgpaxlbJi53GTgARW8IeCsbPwArLjDdXIKikqQMrJAAR3q4USEWKTQuAFpzOAATYcYQL1R2GXcAYQgDA1RkNBkZMZyoNzyAQRgvdhVveFEo03NSzL8ACxgDGQB1K-Z4LhcwOF1JZ-YAN2eFZZgLjKEA-XwASSgI1gujA0TY2yhuhgCjyF2aLCEtnu6hYy3MPyiYzMtn4ME6qDci3Rfhc-FJy0W-E0QxEUDGmLMMHu7CGMCuyAAHAAGJj8OBtdjiilUpaNMpMGCoFQ8vkCpAAJiY3ls8WV6QVIDgBhUwxGQ2MqE23kpcAAYhB+Is9u5lqgjhAQABfL1AA

https://prettier.io/playground/#N4Igxg9gdgLgprEAuEBDABIdW10e7gOlIEIbg7fuGmGDaIYALbgALtV2GBCviADQgQAOMAltAM7JQqAE4iIAdwAKohIJSoANhNQBPQewBGI1GADWcGAGVUAWzgAZHlDjIAZkv5wtO-YaOdd1gObIYIgFdnECdTHj9A4LgAD044ER5zWCUAFXioUR44eQdFJ3Z+H0U4AEUAiHh7R2CAK35ooyLS8sqkXPyQAEcWuClxTnk0fgBaGzgAEwm2EH9UHkUfAGEIU1NUZDRFRWnCqG9igEEYfx5NAPgpeKsbKrzggAsYU0UAdXueeH5PMDgjOQ+eAA3D6qDZgfgaECAoIASSgk1gRjACW4B3hRhgqmKtw6nHETheOk4GxsgPi02sThEMD6qG8axxwU8IipGzWIj040kUGmeOsMBePHGMHuyAAHAAGdgiODdHgy2n09ZtarsGCoTSC4WipAAJnYAScKQ1OVVIDgpk0E0m4wsqD2ATpcAAYhARGtjj4NqhzhAQABff1AA

Checklist

• I’ve added tests to confirm my change works.
• (If changing the API or CLI) I’ve documented the changes I’ve made (in the docs/ directory).
• (If the change is user-facing) I’ve added my changes to changelog_unreleased/*/XXXX.md file following changelog_unreleased/TEMPLATE.md.
• I’ve read the contributing guidelines.

✨Try the playground for this PR✨