Assign a number to the start of a group and all rows bewteen

[hellyars]

Edited. 

Real data attached as YXZP.

Reference image below. 

I want to find each occurrence (row) that starts with the class below.

<div class="tcDtlSegFrame"...

As seen below, there are 6 occurrences.  I want to assign a number 1-6 to each respective occurrence and the corresponding number for all the rows between.

[gabrielvilella]

It is hard to provide a suggestion without the dataset. 

[hellyars]

@gabrielvilella 

Added zip containing extracted h t m l and image of h t m l structure.  Note Frame = tcDtlSegFrame and so on.

[hellyars]

I already isolated the relevant text by cutting everything above and below using a few Multi Row tools.

[hellyars · Accepted solution]

It is not elegant, but it works. 

1. Created a field using the Formula tool to tag the relevant rows.

if startswith([Text],'<div class="tcDtlSegFrame"') then 1 else null() endif ​

•  Filtered on the tagged rows to isolate the 6 relevant entries; used a second Record tool to create a new called Tag for each of the 6 entries.
•  Joined everything back together and sorted on my original RecordID to get the rows back in order.
• Extended the Tag to the null values between Tags.

if isnull([Tag]) then [Row-1:Tag] else [Tag] endif