PCRE 4.5 revisited :(

I am trying to reduce this into something "smaller/shorter" -
/213\.37\.(?:(?:(?:1(?:[5-9][0-9])|(?:2(?:0|1|2|3|4)[0-9])|(?:25[0-1]))))\.\d{1,3}/

Obviously I am brain dead =/ I have tried -

/213\.37\.[150-251]\.[0-255]/   or
/213\.37\.(?:[150-251])\.(?:[0-255])/  or
/213\.37\.(?:150...251)\.(?:0...255)/

But while they are syntactically correct (no error is generated using PCRE 4.5) -- none work :(

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