extr_post_category returns the category of a PTT
post title.
extr_post_category(post_title)
| post_title | Character. UTF-8 encoding and no leading space in string. |
|---|
If there is square-bracket-match or
Re:-match, the function returns a string.
Else, the function returns string No.
This function extracts the category from the title based
on regular expressions. It extracts the content inside
the square brackets ([, ]) of the title.
If there is no square bracket, it searches for
Re: and extracts this pattern.
If neither is matched, the function returns
string No.