preg_replace函数用于PHP中的多个匹配

Question

I am trying to get the base64 code for the insert image string using summer note js editor.

I manage to get this

preg_replace('#<img\ssrc="data:image/([\w]+);base64,([a-zA-Z0-9+/-_=]+)"\sstyle="width:\s[0-9]+px;">#',"IMAGE REMOVED FROM CHROME\r\n", $content,-1, $counter);

AS well as a few variations depending on

The position of the style and data-filename and src are always changing depending on different browsers and so i have a few variations.

1) Are there easier way to do this?

Like if i have all components of img src, style and data-filename , i will just match the string? I can create all the variations but if i were to do $content = preg_replace 10 times for 10 different variations, isn't it extremely slow just to find one match? And it becomes increasingly slower if my $string is extremely long.

2) I need to pull out the base64 string to save it as a image, how can i use the regex above to help me to fopen, fwrite, fclose?

Thanks in advanced.

Answer 1

You might use something like this:

<img(\s+src="data:image/([\w]+);base64,([\w+/-_=]+)")?(\s+style="width:\s*([\d]+)px;")?\s*>

You can look at this working example .

This way, it covers the absence of src and/or style attributes.
It's up to you to eventually refine it to:

• change the 2 attribute groups to non-capturing, depending on how you find them useful or not
• also make their contents partially optional, or even optionally richer (eg style might include other properties)

Some additional points:

• in order to face any case, I replaced \\s by \\s+ between attributes, and at the opposite by \\s* inside of style
• I simplified [a-zA-Z0-9+/-_=]+ and [0-9]+ expressions, which become [\\w+/-_=]+ and [\\d]+
• I added capturing parenthesis around this last one (from your question, seems that you need to get width when available)