Replacing some text in multiple lines - Notepad++

Question

I want to change some text but not digits

<img src=“BISM1281.png” id=“Image3” alt="">
<img src=“BISM1282.png” id=“Image3” alt="">
<img src=“BISM1283.png” id=“Image3” alt="">
to
<img src=“101BISM1281.png” id=“Image3” alt="">
<img src=“101BISM1282.png” id=“Image3” alt="">
<img src=“101BISM1283.png” id=“Image3” alt="">

I want to add some text or numbers before BISM, but don't want to change anything after BISM. Cannot use simple search and replace because “img src=“BISM” is using in different locations.

Answer 1

• Ctrl+H
• Find what: src="\K(?=BISM.+?id="Image3")
• Replace with: 101
• CHECK Match case
• CHECK Wrap around
• CHECK Regular expression
• UNCHECK . matches newline
• Replace all

Explanation:

src="               # literally
\K                  # forget all we have seen until this position
(?=                 # positive lookahead, make sure we have after:
    BISM                # literally
    .+?                 # 1 or more any character but newline
    id="Image3"         # literally
)                   # end lookahead

Screenshot (before):

Screenshot (after):