Regular Expressions 101

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/
Try upload file :\s+Upload File (?<file>.*?)\s+(?<msg>\w+,[^+.]\.)\s+Closing log at (?<time>\d+:\d+:\d+\s+\w+) on (?<date>\d+\/\d+\/\d+)
/
gm
Try upload file : matches the characters Try upload file : literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Upload File matches the characters Upload File literally (case sensitive)
Named Capture Group file
(?<file>.*?)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Named Capture Group msg
(?<msg>\w+,[^+.]\.)
\w
matches any word character (equivalent to [a-zA-Z0-9_])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
, matches the character , literally (case sensitive)
Match a single character not present in the list below
[^.]
\. matches the character . literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Closing log at matches the characters Closing log at literally (case sensitive)
Named Capture Group time
(?<time>\d+:\d+:\d+\s+\w+)
\d
matches a digit (equivalent to [0-9])
: matches the character : literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
: matches the character : literally (case sensitive)
\d
matches a digit (equivalent to [0-9])
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
\w
matches any word character (equivalent to [a-zA-Z0-9_])
on matches the characters on literally (case sensitive)
Named Capture Group date
(?<date>\d+\/\d+\/\d+)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String