Regular Expressions 101

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/
TransactionId\=(?P<TransactionId>[^ ]*).*\s+.*PaymentId\=(?P<PaymentId>[^,]*)
/
gm
TransactionId
matches the characters TransactionId literally (case sensitive)
\= matches the character = with index 6110 (3D16 or 758) literally (case sensitive)
Named Capture Group TransactionId
(?P<TransactionId>[^ ]*)
Match a single character not present in the list below
[^ ]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
matches the character with index 3210 (2016 or 408) literally (case sensitive)
.
matches any character (except for line terminators)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\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)
.
matches any character (except for line terminators)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
PaymentId
matches the characters PaymentId literally (case sensitive)
\= matches the character = with index 6110 (3D16 or 758) literally (case sensitive)
Named Capture Group PaymentId
(?P<PaymentId>[^,]*)
Match a single character not present in the list below
[^,]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
, matches the character , with index 4410 (2C16 or 548) literally (case sensitive)
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