A little experience.

When writing the dnn module, because of the use of regular matching, the startindex error occurs, and finally found that the UTF-8 and GB encoding problems. Select Save As in vs to save. CSCodeIf it is stored as UTF-8, the problem is solved.

There is also a headache for the creation of regular expressions. However, with a small tool and regular expression verification tool, you can compare the regular expression tutorial with the test at to debug the appropriate regular expressions.

If you want to remove a segment, you can use indexof to locate the start and end positions and use remove to delete them.

This is a little experience. Don't laugh.

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