Thanks Jim. that explains clearly. On 2018/7/12 星期四 PM 10:00, Jim Gibson wrote:
On Jul 12, 2018, at 5:50 AM, Lauren C. <lau...@miscnote.net> wrote: thanks for the kind helps. do you know what the expression in { } stands for? ^(\S+) - - \[(\S+).*\] \"GET (.*?/)\s+Here is a breakdown: ^ Start looking for matches at beginning of string (\S+) Match a consecutive sequence of non-whitespace characters and save in the $1 variable — Match the literal string ‘ — ‘ \[ Match the character ‘[‘ (\S+) Match a consecutive sequence of non-whitespace characters and save in the $2 variable .* Match any consecutive zero or more characters \] Match the character ‘]’ (space) Match a space character \” Match the character ‘“‘ GET Match the literal string ‘GET ‘ (with a space at the end) (.*?/) Match the shortest string of any consecutive characters up to but not including a following whitespace and save in $3 \s+ Match any consecutive sequence of whitespace characters If all of the above entities are matched, then the regular expression evaluation returns true and the 41, $2, and $3 variables are assigned to their captured matches.
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