python - Need help in this Regular Expression -


the regular expression using:

%s??[a-z](:\d+|)(^\[)?

the string is:

"%sprix %s[4] online %s[3]:6 pshopping %s:9 in %s"

i trying find %s string except %s[4] , %s[3].

my output using above regular expression not giving expected results.

expected output is:

%s, %s:9, %s

my output is:

%s, %s[ , %s[, %s:9, %s

you may use

%s(?!\[)(?::\d+)?

see regex demo.

details:

  • %s - percentage sign , s
  • (?!\[) - not followed [
  • (?::\d+)? - optional sequence of : , 1 or more digits

the above regex fail match in cases when %s followed [, e.g. in %s[text. if want fail match when %s followed [+number+], use %s(?!\[\d+\])(?::\d+)?.


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