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/

^(?!.*\+\+) # não aceita dois "+" seguidos
[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)* # username
@ # arroba
[A-Za-z0-9-]+(\.[A-Za-z0-9]+)*(\.[A-Za-z]{2,})$ # domínio

/

gmx

^ asserts position at start of a line

Negative Lookahead

(?!.*\+\+)

Assert that the Regex below does not match

.

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)

\+ matches the character + with index 43_{10} (2B_{16} or 53_{8}) literally (case sensitive)

\+ matches the character + with index 43_{10} (2B_{16} or 53_{8}) literally (case sensitive)

# não aceita dois "+" seguidos

não aceita dois "+" seguidosComment: não aceita dois "+" seguidos

Match a single character present in the list below

[_A-Za-z0-9-\+]

+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)

_ matches the character _ with index 95_{10} (5F_{16} or 137_{8}) literally (case sensitive)

A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)

a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

- matches the character - with index 45_{10} (2D_{16} or 55_{8}) literally (case sensitive)

This hyphen is treated literally, which might be confusing for others. Consider escaping it or placing at the start or end of the class!

\+ matches the character + with index 43_{10} (2B_{16} or 53_{8}) literally (case sensitive)

1st Capturing Group

(\.[_A-Za-z0-9-]+)*

* 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 46_{10} (2E_{16} or 56_{8}) literally (case sensitive)

Match a single character present in the list below

[_A-Za-z0-9-]

+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)

_ matches the character _ with index 95_{10} (5F_{16} or 137_{8}) literally (case sensitive)

A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)

a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

- matches the character - with index 45_{10} (2D_{16} or 55_{8}) literally (case sensitive)

# username
@

usernameComment: username

@ matches the character @ with index 64_{10} (40_{16} or 100_{8}) literally (case sensitive)

# arroba

arrobaComment: arroba

Match a single character present in the list below

[A-Za-z0-9-]

+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)

A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)

a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

- matches the character - with index 45_{10} (2D_{16} or 55_{8}) literally (case sensitive)

2nd Capturing Group

(\.[A-Za-z0-9]+)*

* 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 46_{10} (2E_{16} or 56_{8}) literally (case sensitive)

Match a single character present in the list below

[A-Za-z0-9]

A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)

a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)

0-9 matches a single character in the range between 0 (index 48) and 9 (index 57) (case sensitive)

3rd Capturing Group

(\.[A-Za-z]{2,})

\. matches the character . with index 46_{10} (2E_{16} or 56_{8}) literally (case sensitive)

Match a single character present in the list below

[A-Za-z]

{2,} matches the previous token between 2 and unlimited times, as many times as possible, giving back as needed (greedy)

A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)

a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)

$ asserts position at the end of a line

Comment: domínio

Global pattern flags

g modifier: **g**lobal. All matches (don't return after first match)

m modifier: **m**ulti line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)

x modifier: e**x**tended. Spaces and text after a # in the pattern are ignored

Your regular expression does not match the subject string.Try launching the debugger to find out why.

/

/

gmx

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