CODEWITHSUNDEEP
phpregexformsinputhtml-parsing
Ciprian
Ciprian

Reputation: 45

Regular Expression: Replace multiple input fields with their values

I want to use regular expressions to replace input tags with their corresponding values. The search must include the name of the input, since I have multiple inputs in the same form that need replacing.

For example, I need the following string: 

<input value="Your Name" name="custom_field_1">

to become: 

Your Name

My current code looks like this:

foreach ($_POST as $key => $value) {
   if($key == 'post_id') continue;
   $content = preg_replace("/<\s* input [^>]+ >/xi", htmlspecialchars($value), $content);
}

However, this will replace ALL inputs with the first value, so I need to refine the regex to include the name.

Thank you very much for your help!

Upvotes: 0

Views: 1119

Answers (2)

user557597
user557597

Reputation:

This should work.
Just replace the match with $1 

 # (?s)<input(?=\s)(?>(?:(?<=\s)value\s*=\s*"([^"]+)"|".*?"|'.*?'|[^>]*?)+>)(?(1)|(?!))

 (?s)
 <input                        # Input tag
 (?= \s )
 (?>                           # Atomic grouping
      (?:
           (?<= \s )
           value  \s* = \s*              # 'value' attribute
           "
           (                             # (1 start), 'value' data
                [^"]+ 
           )                             # (1 end)
           "
        |  " .*? "
        |  ' .*? '
        |  [^>]*? 
      )+
      >
 )
 (?(1)                         # Conditional - Only input tags with a 'value' attr
   |  (?!)
 )

Sample: 

<input type="hidden" value="Special:Search" name="title" />

Output: 

 **  Grp 0 -  ( pos 0 , len 59 ) 
<input type="hidden" value="Special:Search" name="title" />  
 **  Grp 1 -  ( pos 28 , len 14 ) 
Special:Search

Upvotes: 1

Andris Leduskrasts
Andris Leduskrasts

Reputation: 1230

You can match the whole string, capture the value by using parenthesis (..), making a capture group, and replacing the match with $1 - the first capture group.

<input value="(.+?)" name=".*?">

https://regex101.com/r/rH1wA2/3

Try: preg_replace("<input value=\\"(.+?)\\" name=\\".*?\\">", $1, $str)

Note that this regex has "value", "name" and even spaces. If your strings sometimes look different, you have to take that to account and change the regex accordingly. <input value="(.+?)"[^>]*>, for example, to replace no matter what follows your desired value.

Upvotes: 1

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