Regular Expressions 101

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/
(([^<>()\[\]\.,;:\s@\"](\.[^<>()\[\]\.,;:\s@\"])*)|(\".\"))@(([^<>()\.,;\s@\"]\.)+([^<>()\.,;:\s@\"]|[\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)
\[ matches the character [ literally (case sensitive)
\] matches the character ] literally (case sensitive)
\. matches the character . 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 @ literally (case sensitive)
\" matches the character " 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 . literally (case sensitive)
Match a single character not present in the list below
[^<>()\[\]\.,;:\s@\"]
2nd Alternative
(\".\")
4th Capturing Group
(\".\")
\" matches the character " 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 " literally (case sensitive)
@ matches the character @ literally (case sensitive)
5th Capturing Group
(([^<>()\.,;\s@\"]\.)+([^<>()\.,;:\s@\"]|[\d\.]))
6th Capturing Group
([^<>()\.,;\s@\"]\.)+
+ 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 . 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 @ literally (case sensitive)
\" matches the character " literally (case sensitive)
\.
matches the character . 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@\"]|[\d\.])
1st Alternative
[^<>()\.,;:\s@\"]
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 . 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 @ literally (case sensitive)
\" matches the character " 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 . 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