fix bug: custom component can't accept decimals

Author: 28raining

smith_chart/index.html

@@ -530,7 +530,7 @@ <h5 class="modal-title" id="customZModalTitle">Modal title</h5>
 							<div id="customZValidWarning" class="text-danger" style="display:none">
 								If the textbox contains a comma it's assumed your data is comma separated, otherwise assumes whitespace separated.
 								Each line must have 3 non-blank numberical values.
-								The only accepted characters are 0-9, '-', '+', e, E and ','.
+								The only accepted characters are 0-9, '-', '+', '.', e, E and ','.
 								Frequency must be increasing
 							</div>
 						</div>

smith_chart/js/smith_tool.js

@@ -1382,7 +1382,7 @@ function createCustomZModal (index) {
   checkCustomZValid();
 }
 
-const regexCustomZ = /[^0-9,eE\s\-\+]/;  //list of acceptable characters
+const regexCustomZ = /[^0-9,eE\s\-\+\.]/;  //list of acceptable characters
 const regexCustomZComma = /[,]/;
 var customZImpedanceTable = [];