python - Stumped with a regular expression -


i have lines in file so:

l_12_interval         j_10_int length:100         min.   :-2120803808 class :character   1st qu.: -992076064 mode  :character   median :  263935522                    mean   :  -33801580                    3rd qu.:  896644601                    max.   : 1890084945                    na's   :53

i want parse out i'll call last "major column":

   j_10_int min.   :-2120803808 1st qu.: -992076064 median :  263935522 mean   :  -33801580 3rd qu.:  896644601 max.   : 1890084945 na's   :53

the columns aligned can't depend on the last major column start. heading not problem , trying compose regular expression python's re.sub() function strip off preceding label. thought including label , colon in regular expression subexpression , replace matching expression subexpression. easier said done! closest i've gotten:

>>> line '       length:100         min.   :-2120803808' >>> re.sub(r"^.*([a-z1-9][a-z1-9.' ]*:)", r"\1", line, re.ignorecase) 'n.   :-2120803808' >>>

i thought toss whitespace before beginning of subexpression that's not working:

>>> re.sub(r"^.*\s([a-z1-9][a-z1-9.' ]*:)", r"\1", line, re.ignorecase) '       length:100         min.   :-2120803808' >>> re.sub(r"^.* ([a-z1-9][a-z1-9.' ]*:)", r"\1", line, re.ignorecase) '       length:100         min.   :-2120803808' >>> re.sub(r"^.*( [a-z1-9][a-z1-9.' ]*:)", r"\1", line, re.ignorecase) '       length:100         min.   :-2120803808' >>> re.sub(r"^.*(\w[a-z1-9][a-z1-9.' ]*:)", r"\1", line, re.ignorecase) 'in.   :-2120803808'

as can see, tried pulling whitespace inside subexpression... acceptable. i'm still not closer complete solution.

does have suggestions?

this 1 bases quite few assumptions format of names , of values of first column, works example:

^(?:[a-z][a-z]+\s*:[a-z0-9]*|)\s*([a-z0-9].*)$

probably needs bit more work based on know formats of different names , values.

demo: http://regex101.com/r/op3pt2


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