User:Richardguk/Test.js

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if (document.URL.getParamValue('rgukToAdd')) {
 var newtext=document.URL.getParamValue('rgukToAdd');
 var myelm=document.getElementById('wpTextbox1');
 var myvar1=myelm.value;
 var myvar2=myvar1.replace(/^([^]*)(\s*category\s*:[^\]]*]].*)(.*?)$/igm, '$1$2\n' + newtext + '$3');
 alert('was:'+ myvar1.length + ' plus:'+newtext.length+' ='+(myvar1.length+newtext.length)+' new:'+myvar2.length);
 myelm.value=myvar2;
 myelm.focus();
 myelm.setSelectionRange(myelm.value.length,myelm.value.length);
}