PHP的正则表达式：匹配一组引号中的字符[重复]

Question

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• How do you parse and process HTML/XML in PHP? 30 answers

<input name="so and so" id="john doe" value="something something" />

I want to match only the space character that is within the " of a value= attribute.

I came up with this:

value="[^"',:<>/
]*[ ][^"',:<>/
]*"

Problem is this matches the whole string, where I just need the space in the matched string from above.

I am reading some tutorials, which leads me to think I need to use a conditional statement, but I can't seem to figure out how that would work. My guess (which of course didn't work) was:

(?(?=value="[^"',:<>/
]*[^"',:<>/
]*")[ ])

Any help is appreciated. Thanks!

</div>

Answer 1

\bvalue="\K|\G(?!^)[^"]*?\K\s+

You can use this to find spaces which are in value=" and before closing ".See demo.

https://regex101.com/r/lR1eC9/11

EDIT:

(?:(?<=\bvalue=")|\G(?!^))[^"]*?\K\s+(?=[^"=]*")

See demo.

https://regex101.com/r/lR1eC9/13