# Helper function to split a string into a list of strings and numbers
proc split_strings_and_numbers { str } {
  set result {}
  foreach {all letters numbers} [regexp -all -inline {(\D*)(\d*)} $str] {
    if { $letters ne "" } {
      lappend result $letters
    }
    if { $numbers ne "" } {
      lappend result [expr { $numbers + 0 }] ;# Convert to integer
    }
  }
  return $result
}

# Custom comparison function
proc natural_compare { str1 str2 } {
  set list1 [split_strings_and_numbers $str1]
  set list2 [split_strings_and_numbers $str2]
  set len [expr { min([llength $list1], [llength $list2]) }]
  for { set i 0 } { $i < $len } { incr i } {
    set part1 [lindex $list1 $i]
    set part2 [lindex $list2 $i]
    if { $part1 ne $part2 } {
      if { [string is integer -strict $part1] && [string is integer -strict $part2] } {
        return [expr { $part1 - $part2 }]
      } else {
        return [string compare $part1 $part2]
      }
    }
  }
  return [expr { [llength $list1] - [llength $list2] }] ;# If all parts are equal, compare by length
}

proc natural_sort { list } {
  return [lsort -command natural_compare $list]
}

proc match_pins { regex { direction .* } { is_clock 0 } } {
  set pins {}
  # The regex for get_ports is not the tcl regex
  foreach pin [get_ports -regex .*] {
    set input [get_property $pin name]
    # We want the Tcl regex
    if { ![regexp $regex $input] } {
      continue
    }
    if { ![regexp $direction [get_property $pin direction]] } {
      continue
    }
    if { $is_clock != [sta::is_clock_src [sta::get_port_pin $pin]] } {
      continue
    }
    lappend pins [get_property $pin name]
  }
  return [natural_sort $pins]
}