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- PCRE2 (PHP >=7.3)
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^[a-zA-Z0-9_-]+(?:\.[a-zA-Z0-9_-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?$

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gm

^ asserts position at start of a line

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 97) and z (index 122) (case sensitive)

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

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

_-

matches a single character in the list _- (case sensitive)Non-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)

\. 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)

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

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

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

_-

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

Non-capturing group

(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+

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

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 97) and z (index 122) (case sensitive)

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

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

Non-capturing group

(?:[a-zA-Z0-9-]*[a-zA-Z0-9])?

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

Match a single character present in the list below

[a-zA-Z0-9-]

* matches the previous token between zero 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 97) and z (index 122) (case sensitive)

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

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 97) and z (index 122) (case sensitive)

A-Z matches a single character in the range between A (index 65) and Z (index 90) (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 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 97) and z (index 122) (case sensitive)

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

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

Non-capturing group

(?:[a-zA-Z0-9-]*[a-zA-Z0-9])?

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

Match a single character present in the list below

[a-zA-Z0-9-]

* matches the previous token between zero 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 97) and z (index 122) (case sensitive)

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

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 97) and z (index 122) (case sensitive)

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

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

$ asserts position at the end of a line

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)

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

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gm

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