Regular Expressions 101

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/
POST\s[^\/]+\/user\/(?<userid>[^\/]+)\/def\/(?<defid>[^\/]+)\/\S+
/
POST
matches the characters POST literally (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
Match a single character not present in the list below
[^\/]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
user
matches the characters user literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
Named Capture Group userid
(?<userid>[^\/]+)
Match a single character not present in the list below
[^\/]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
def
matches the characters def literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
Named Capture Group defid
(?<defid>[^\/]+)
Match a single character not present in the list below
[^\/]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
\/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
\S
matches any non-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)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/

Test String