javascript - What does js regular match match?

Question

/^[\s\u3000]*|[\s\u3000]*$/

Answer 1

s means English space, u3000 means Chinese space
^[su3000]* matches the beginning of a space, [su3000]*$ matches if there is a space at the end, Wu Ke is right

Answer 2

Match Chinese and English spaces at the beginning or end of the line

Answer 3

Match half-width and full-width spaces before and after a string