Regular Expressions 101

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"
^(.*?)(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?(?:;(.+?))?$
"
gmix
^ asserts position at start of a line
1st Capturing Group
(.*?)
.
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)
Non-capturing group
(?:;(.+?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
; matches the character ; with index 5910 (3B16 or 738) literally (case insensitive)
2nd Capturing Group
(.+?)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
Non-capturing group
(?:;(.+?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
; matches the character ; with index 5910 (3B16 or 738) literally (case insensitive)
3rd Capturing Group
(.+?)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
Non-capturing group
(?:;(.+?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
; matches the character ; with index 5910 (3B16 or 738) literally (case insensitive)
4th Capturing Group
(.+?)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
Non-capturing group
(?:;(.+?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
; matches the character ; with index 5910 (3B16 or 738) literally (case insensitive)
5th Capturing Group
(.+?)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
Non-capturing group
(?:;(.+?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
; matches the character ; with index 5910 (3B16 or 738) literally (case insensitive)
6th Capturing Group
(.+?)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
Non-capturing group
(?:;(.+?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
; matches the character ; with index 5910 (3B16 or 738) literally (case insensitive)
7th Capturing Group
(.+?)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
Non-capturing group
(?:;(.+?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
; matches the character ; with index 5910 (3B16 or 738) literally (case insensitive)
8th Capturing Group
(.+?)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
Non-capturing group
(?:;(.+?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
; matches the character ; with index 5910 (3B16 or 738) literally (case insensitive)
9th Capturing Group
(.+?)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
Non-capturing group
(?:;(.+?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
; matches the character ; with index 5910 (3B16 or 738) literally (case insensitive)
10th Capturing Group
(.+?)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
Non-capturing group
(?:;(.+?))?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
; matches the character ; with index 5910 (3B16 or 738) literally (case insensitive)
11th Capturing Group
(.+?)
.
matches any character (except for line terminators)
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
Non-capturing group
(?:;(.+?))?
Non-capturing group
(?:;(.+?))?
Non-capturing group
(?:;(.+?))?
Non-capturing group
(?:;(.+?))?
Non-capturing group
(?:;(.+?))?
Non-capturing group
(?:;(.+?))?
Non-capturing group
(?:;(.+?))?
Non-capturing group
(?:;(.+?))?
Non-capturing group
(?:;(.+?))?
$ asserts position at the end of a line
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)
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
x modifier: extended. Spaces and text after a # in the pattern are ignored
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"
gmix

Test String