Maximum Hex value in regex

Question

Without using u flag the hex range that can be used is [\\x{00}-\\x{ff}], but with u flag it goes up to a 4-byte value \\x{7fffffff}

Answer 1

"but want to know about the max hex boundary in a regex": * in all utf modes: 0x10ffff * native 8-bt mode: 0xff * native 16-bit mode: 0xffff * native 32-bit mode: 0x1fffffff