Regex extract only the closest numbers at both sides of a word (word boundaries?)

I want to retrieve only numbers (can have a dot or coma)  that are just before or after one (see below) specific word ( "size" in this case).

123 size 23456 bbb    ->  123  and 23456
aa 123size23456             ->  123 and 23456
1.234 size 55.567       -> 1234 (or 1.234) and 55567
1234 size forget  345            -> 1234
aa12 size 14587          -> 14587

The ideal was to use the expression for several words  as    ?:size|area|length and also ignore characters not belonging to alphabet as space, /,-    ( example "1245/size/ 12"   would return   1245    12) if not too complex!
Can you help me?
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This regex pattern seems to come close:

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With your data, it parsed the following:
Match 0 Start(0) Length(14) 
	SubMatch 0: 123
	SubMatch 1: 23456

Match 1 Start(23) Length(12) 
	SubMatch 0: 123
	SubMatch 1: 23456

Match 2 Start(37) Length(17) 
	SubMatch 0: 1.234
	SubMatch 1: 55.567

Match 3 Start(56) Length(10) 
	SubMatch 0: 1234
	SubMatch 1: 

Match 4 Start(81) Length(13) 
	SubMatch 0: 12
	SubMatch 1: 14587

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Question: In the last line, why aren't you getting the 12?
This pattern does not pick up the aa12 in the last line of your data.

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please post some more examples of non-space characters used as delimiters.
When using this pattern:

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the space delimited strings still parse correctly as well as this:
123 /size/ 23456 bbb
1245/size/ 12

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novreisbAuthor Commented:
Hi aikimark,
Thank you very much by the solution! Just one very small aspect was not contemplated! The hypothesis of having more than one "keyword". But it is not relevant!
novreisbAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for novreisb's comment #a40239982

for the following reason:

The solution is not mine  and was my mistake , so I ask you to correct!
as far as different 'keywords' is concerned, you would just replace the "size" part of the pattern.  If you have a limited number of such keywords, they can be part of the regex pattern.

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