Regex: Curly braces in reverse? Match X characters before a string?

In the following example, how could I match an X number of characters before and after (myword1 myword2):

word1 word2 word3 myword1 myword2 word4 word5 word6

Matching after is easy with curly braces: (myword1 myword2)(.+?){10} – but how could I match the preceding 10 characters before (myword1 myword2)?

I tried (.+?){10}(myword1 myword2), but that exceeded the memory limit.

>Solution :

You could use:

.{10}: match any character 10 times

So your expression becomes:
.{10}(myword1 myword2)

And the match is: rd2 word3 myword1 myword2