Regular Expressions 101

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/
(([^<>()\[\]\.,;:\s@\"]+(\.[^<>()\[\]\.,;:\s@\"]+)*)|(\".+\"))@(([^<>()\.,;\s@\"]+\.{0,1})+([^<>()\.,;:\s@\"]{2,}|[\d\.]+))
/
g
1st Capturing Group
(([^<>()\[\]\.,;:\s@\"]+(\.[^<>()\[\]\.,;:\s@\"]+)*)|(\".+\"))
1st Alternative
([^<>()\[\]\.,;:\s@\"]+(\.[^<>()\[\]\.,;:\s@\"]+)*)
2nd Capturing Group
([^<>()\[\]\.,;:\s@\"]+(\.[^<>()\[\]\.,;:\s@\"]+)*)
Match a single character not present in the list below
[^<>()\[\]\.,;:\s@\"]
+ 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)
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
,;:
matches a single character in the list ,;: (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
@ matches the character @ with index 6410 (4016 or 1008) literally (case sensitive)
\" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
3rd Capturing Group
(\.[^<>()\[\]\.,;:\s@\"]+)*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
Match a single character not present in the list below
[^<>()\[\]\.,;:\s@\"]
+ 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)
\[ matches the character [ with index 9110 (5B16 or 1338) literally (case sensitive)
\] matches the character ] with index 9310 (5D16 or 1358) literally (case sensitive)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
,;:
matches a single character in the list ,;: (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
@ matches the character @ with index 6410 (4016 or 1008) literally (case sensitive)
\" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
2nd Alternative
(\".+\")
4th Capturing Group
(\".+\")
\" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
.
matches any character (except for line terminators)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
@ matches the character @ with index 6410 (4016 or 1008) literally (case sensitive)
5th Capturing Group
(([^<>()\.,;\s@\"]+\.{0,1})+([^<>()\.,;:\s@\"]{2,}|[\d\.]+))
6th Capturing Group
([^<>()\.,;\s@\"]+\.{0,1})+
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
Match a single character not present in the list below
[^<>()\.,;\s@\"]
+ 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)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
,;
matches a single character in the list ,; (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
@ matches the character @ with index 6410 (4016 or 1008) literally (case sensitive)
\" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
\.
matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
{0,1} matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
7th Capturing Group
([^<>()\.,;:\s@\"]{2,}|[\d\.]+)
1st Alternative
[^<>()\.,;:\s@\"]{2,}
Match a single character not present in the list below
[^<>()\.,;:\s@\"]
{2,} matches the previous token between 2 and unlimited times, as many times as possible, giving back as needed (greedy)
<>()
matches a single character in the list <>() (case sensitive)
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
,;:
matches a single character in the list ,;: (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
@ matches the character @ with index 6410 (4016 or 1008) literally (case sensitive)
\" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
2nd Alternative
[\d\.]+
Match a single character present in the list below
[\d\.]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\d matches a digit (equivalent to [0-9])
\. matches the character . with index 4610 (2E16 or 568) literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
g

Test String