Both solutions work a treat !

Appreciate the fast turn around

Oh… @stuart-dyer, I think I’ve found an very easy way to visualize all the duplicated values of any attribute, of your HTML text , in one go !

So, let’s start with this INPUT text :

     <SymbolVar name="DATABASE_NAME" value="DB1"/>
     <SymbolVar name="DATABASE_NAME" value="DB2"/>
     <SymbolVar name="ABCD" value="123"/>
     <SymbolVar name="PORT" value="34"/>
     <SymbolVar name="SERVER_NAME" value="Server1"/>
     <SymbolVar name="EFGH" value="123"/>
     <SymbolVar name="IJKL" value="456"/>
     <SymbolVar name="SERVER_NAME" value="Server2"/>
     <SymbolVar name="SERVER_NAME" value="Server3"/>
     <SymbolVar name="MNOP" value="456"/>
     <SymbolVar name="DATABASE_NAME" value="DB3"/>

• Duplicate your entire text, right AFTER a separation line of, at least, 3 sharp characters. If you text already contains some # characters , just use an other separator !

So, from our simple example, we get this text :

     <SymbolVar name="DATABASE_NAME" value="DB1"/>
     <SymbolVar name="DATABASE_NAME" value="DB2"/>
     <SymbolVar name="ABCD" value="123"/>
     <SymbolVar name="PORT" value="34"/>
     <SymbolVar name="SERVER_NAME" value="Server1"/>
     <SymbolVar name="EFGH" value="123"/>
     <SymbolVar name="IJKL" value="456"/>
     <SymbolVar name="SERVER_NAME" value="Server2"/>
     <SymbolVar name="SERVER_NAME" value="Server3"/>
     <SymbolVar name="MNOP" value="456"/>
     <SymbolVar name="DATABASE_NAME" value="DB2"/>
################
     <SymbolVar name="DATABASE_NAME" value="DB1"/>
     <SymbolVar name="DATABASE_NAME" value="DB2"/>
     <SymbolVar name="ABCD" value="123"/>
     <SymbolVar name="PORT" value="34"/>
     <SymbolVar name="SERVER_NAME" value="Server1"/>
     <SymbolVar name="EFGH" value="123"/>
     <SymbolVar name="IJKL" value="456"/>
     <SymbolVar name="SERVER_NAME" value="Server2"/>
     <SymbolVar name="SERVER_NAME" value="Server3"/>
     <SymbolVar name="MNOP" value="456"/>
     <SymbolVar name="DATABASE_NAME" value="DB2"/>

• Open the Mark dialog ( Ctrl + M )

• Untick all box options

• Check the Purge for each search option

• Possibly, check the Bookmark line and Wrap around options

• Type in, in the Find what zone, this simple regex to mark all the duplicated values of any attribute :

  • MARK (?s)="\K(.+?)(?=".*###)(?=".+?\1.+?\1)

• Click on Mark All button

Et voilà !

Note : You can easily adapt this regex to visualize the duplicate values of a specific attribute ! For instance :

• The regex (?s)name="\K(.+?)(?=".*###)(?=".+?\1.+?\1) would mark all the duplicate values of the name attribute, only

• The regex (?s)value="\K(.+?)(?=".*###)(?=".+?\1.+?\1) would mark all the duplicate values of the value attribute, only

When you finish working of your HTML file, simply delete the last part, with the separator line of # chars !

How this regex works ?

• As our search is a multi-lignes one, we use the (?s) modifier to represents text as an unique line

• As we want to aim the values of the attributes, we first search for the string ="

• Then, due to the \K syntax, the current search is cancelled and the regex engine searches for any text till the nearest " character excluded, but ONLY IF two conditions are respected :

  • The line of # charactes must be always located AFTER the current search, due to the (?=".*###) look-head

  • At least, two other occurrences, of the searched value \1, must be present, AFTER the current location, due to the (?=".+?\1.+?\1) look-ahead. Indeed, as we now duplicated our current file, all unique values of attributes, in this modified file, appear two times ONLY and so will not be marked !

Best Regards,

guy038

It will highlight every duplicate instance (that is, it won’t highlight the first occurrence of any name, only the first.

I should note that I use a bunch of \s+ where you could probably just use a simple space and a bunch of \s* that can likely be omitted. That’s mostly just because I like to play it safe with my regexes and not assume that insignificant whitespace will always be the same.