###### Punctuations, US-ASCII

```/[!"#$%&()*+,\-.\/:;<=>?@\[\]^_`{|}~]/```

###### Punctuations, include Unicode ones (\u2000-\u206F: general punctuations, \u2E00-\u2E7F: supplemental punctuations)

```/[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,\-.\/:;<=>?@\[\]^_`{|}~]/```

###### Chinese characters

```/[\u4E00-\u9FFF]/```

###### Non-english letters

```/[\u00C0-\u1FFF\u2C00-\uD7FF]/```

###### All letters

```[\u00C0-\u1FFF\u2C00-\uD7FF\w]```

###### References

- https://stackoverflow.com/questions/4328500/how-can-i-strip-all-punctuation-from-a-string-in-javascript-using-regex
- https://stackoverflow.com/questions/150033/regular-expression-to-match-non-english-characters