1. The string included-string contains, for example, the expression is written as abc, and the content you return is abcd, so even if it matches, it will return TRUE.

2. Include any string-include any string (separated by comma',', dot'.') and slash "/"). There's a problem here.

3. The result is TRUE- TRUE if the regular expression is satisfied, otherwise FALSE.

4. the 4.Result is FALSE- if the regular expression is satisfied, it returns FALSE, otherwise it returns TRUE.

Case-sensitive: Is it case-sensitive?