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^(?P<major>0|[1-9]\d*)\.(?P<minor>0|[1-9]\d*)\.(?P<patch>0|[1-9]\d*)(?:-(?P<prerelease>(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+(?P<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$

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gm

^ asserts position at start of a line

Named Capture Group major

(?P<major>0|[1-9]\d*)

1st Alternative

0

0 matches the character 0 with index 48_{10} (30_{16} or 60_{8}) literally (case sensitive)

2nd Alternative

[1-9]\d*

Match a single character present in the list below

[1-9]

1-9 matches a single character in the range between 1 (index 49) and 9 (index 57) (case sensitive)

\d

matches a digit (equivalent to [0-9])* 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)

Named Capture Group minor

(?P<minor>0|[1-9]\d*)

1st Alternative

0

0 matches the character 0 with index 48_{10} (30_{16} or 60_{8}) literally (case sensitive)

2nd Alternative

[1-9]\d*

Match a single character present in the list below

[1-9]

1-9 matches a single character in the range between 1 (index 49) and 9 (index 57) (case sensitive)

\d

matches a digit (equivalent to [0-9])* 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)

Named Capture Group patch

(?P<patch>0|[1-9]\d*)

1st Alternative

0

0 matches the character 0 with index 48_{10} (30_{16} or 60_{8}) literally (case sensitive)

2nd Alternative

[1-9]\d*

Match a single character present in the list below

[1-9]

1-9 matches a single character in the range between 1 (index 49) and 9 (index 57) (case sensitive)

\d

matches a digit (equivalent to [0-9])* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)

Non-capturing group

(?:-(?P<prerelease>(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?

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

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

Named Capture Group prerelease

(?P<prerelease>(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*)

Non-capturing group

(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)

1st Alternative

0

0 matches the character 0 with index 48_{10} (30_{16} or 60_{8}) literally (case sensitive)

2nd Alternative

[1-9]\d*

Match a single character present in the list below

[1-9]

1-9 matches a single character in the range between 1 (index 49) and 9 (index 57) (case sensitive)

\d

matches a digit (equivalent to [0-9])3rd Alternative

\d*[a-zA-Z-][0-9a-zA-Z-]*

\d

matches a digit (equivalent to [0-9])Match a single character present in the list below

[a-zA-Z-]

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)

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

Match a single character present in the list below

[0-9a-zA-Z-]

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

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)

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

Non-capturing group

(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*

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

Non-capturing group

(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)

1st Alternative

0

0 matches the character 0 with index 48_{10} (30_{16} or 60_{8}) literally (case sensitive)

2nd Alternative

[1-9]\d*

Match a single character present in the list below

[1-9]

1-9 matches a single character in the range between 1 (index 49) and 9 (index 57) (case sensitive)

\d

matches a digit (equivalent to [0-9])3rd Alternative

\d*[a-zA-Z-][0-9a-zA-Z-]*

\d

matches a digit (equivalent to [0-9])Match a single character present in the list below

[a-zA-Z-]

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)

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

Match a single character present in the list below

[0-9a-zA-Z-]

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

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)

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

Non-capturing group

(?:\+(?P<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?

? matches the previous token between zero and one 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)

Named Capture Group buildmetadata

(?P<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*)

Match a single character present in the list below

[0-9a-zA-Z-]

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

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

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)

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

Non-capturing group

(?:\.[0-9a-zA-Z-]+)*

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

Match a single character present in the list below

[0-9a-zA-Z-]

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

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

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)

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