After a few trials and finally I got what you'd meant, well, that seems the trick you taught me:
1. Highlight (in yellow, for example) all the texts;
2. Find & Replace
Find: "[\<][ch][ts][ms][l\>]{1,2}"
Replace: "^&" (Format: Not Highlight)
3. Replace the same texts to be found without highlight (un-highlight)
4. Find & Replace
Find: "*" (Format: Highlight)
Replace: ""
It will replace all the texts (highlighted, and those are texts excluding "<html>" or "<css>") with nothing (same as deleting them)
It works wonders. Thank you.
