Filter out some character problems

Filter some questions 91w.colw.dosing and row%97%col%jiaotilizi.gif # row #98 # col # extraction # row #99 # col # FenPeiXiShu. GIF # row # structure is like this: id + # col # + name + # row #91 # col # neutralization # row #97 # col # JiaoTi filter out some characters
91#col1_dosing and %row%97%col%jiaotilizi.gif # row #98 # col # extraction # row #99 # col # FenPeiXiShu. GIF # row #

The structure is as follows: id + # col # + name + # row #
91 # col # neutralization # row # 9720.col1_jiaotilizi.gif # row #

A lot of such data should be processed out of gif

PHP code

  $contents = preg_replace('/[\w]#col#(.*?).gif#row#'/i,'',$contents);

I want to replace it with NULL. Isn't this a good method?
And this regular expression is incorrect.

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If fixed strings are processed, use the str_replace () function.
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So?

PHP code

$ Str = "91w.colw.lizi.gif # row #98 # col # extraction # row #99 # col # FenPeiXiShu. GIF # row # "; $ str = preg_replace ('/# [\ d?##col==a-z?#.gif # row #/is', '#', $ str); echo $ str;
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PHP code
   
   
$ Contents = preg_replace ('/(col # [^ \.] + )\. gif (# row)/I ',' $1 $ 2', $ s); echo $ contents;
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PHP code
     
     
When string'91w.colw.com and then row%97%col%jiaotilizi.gif # row #98 # col # extraction # row #99 # col # FenPeiXiShu. GIF # row # '; echo preg_replace ('/\ d * # col # [^ #] * (? <= Gif) # row #/I ', '', $ str );