Regular Expressions 101

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"
typedef enum\s*{([^;*]+)}rba_EcuSecu
"
mg
typedef enum
matches the characters typedef enum literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v  ])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
{ matches the character { with index 12310 (7B16 or 1738) literally (case sensitive)
1st Capturing Group
([^;*]+)
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 a single character in the list ;* (case sensitive)
}rba_EcuSecu
matches the characters }rba_EcuSecu literally (case sensitive)
Global pattern flags
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"
mg

Test String