Questions about PHP matching non-keyword bold

PHP matches non-keyword bold problem
How PHP matches only one keyword from left to right, non-keyword bold

As follows:

Keyword: ABC title: ABCDEFGABCDEFG

Get (include HTML code) after match: ABC DEFGABCDEFG

That is, after you enter the keyword ABC, the match title matches only the first ABC in the title and the following ABC is not matched.

Can you tell me how to achieve this?

All I can do now is match all but not just one match from left to right.




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