Just a bit of language mixing Basic, Java, JavaScript = Example JavaScript Replace with RegEx pattern (Tested with JDK9, B4J v5.9).
Sub Replace Text
Example removing an XML block from HTML string
Output
Sub Replace Text
B4X:
Sub JSReplace(pattern As String, Target As String, Replacement As String) As String
Dim Result As String = ""
Dim joSEM As JavaObject
Dim script As String = $"function repl() {var re = ${pattern};var str = "${Target}"; return str.replace(re, '${Replacement}');} repl();"$
joSEM.InitializeNewInstance("javax.script.ScriptEngineManager", Null)
Try
Result = joSEM.RunMethodJO("getEngineByName", Array("nashorn")).RunMethod("eval", Array(script))
Catch
Log($"[ERROR] - ${LastException.Message}"$)
End Try
Return Result
End SubExample removing an XML block from HTML string
B4X:
Dim Str as String
Str = $"<xml>This is an XML block.</xml>This is the text after the XML block<BR>..."$
Log(Str)
Str = JSReplace("/<xml.*?>[\S\s]+?<\/xml>/gi", Str, "")
Log(Str)Output
B4X:
<xml>This is an XML block.</xml>This is the text after the XML block<BR>...
This is the text after the XML block<BR>...