#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?m);\s*"
Local $sString = "51.9499, 7.555780000000027; 51.49705, 9.389030000000048; 51.249182, 6.991165099999989; 47.3163508, 11.09513949999996; 51.33424979999999, 12.574196000000029; 50.0297493, 19.196331099999952; 47.8270212, 16.25014150000004; "
Local $sSubst = ";\n"
Local $sResult = StringRegExpReplace($sString, $sRegex, $sSubst)
MsgBox($MB_SYSTEMMODAL, "Result", $sResult)
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for AutoIt, please visit: https://www.autoitscript.com/autoit3/docs/functions/StringRegExp.htm