regex101: Additional

^start of line

Group 1((?:[A-Za-z0-9+]+)(?:[._-]{1}[A-Za-z]+)*)

Non-Capturing Group(?:[A-Za-z0-9+]+)

Character Class[A-Za-z0-9+]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

Non-Capturing Group(?:[._-]{1}[A-Za-z]+)*

*repeats the group contents below any number of times:

Character Class[._-]{1}

{1}matches one character from the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[A-Za-z]+

+matches at least one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Group 2([._-]{1}(?:[+-_\dA-Za-z.]*)*)*

*repeats the group contents below any number of times:

Character Class[._-]{1}

{1}matches one character from the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:[+-_\dA-Za-z.]*)*

*repeats the group contents below any number of times:

Character Class[+-_\dA-Za-z.]*

*matches any number of characters from the set below:

+-_one character from + (43₁₀) to _ (95₁₀)

\da digit

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

25 tokens

Regular Expression

^((?:[A-Za-z0-9+]+)(?:[._-]{1}[A-Za-z]+)*)([._-]{1}(?:[+-_\dA-Za-z.]*)*)*$

New

AbCd_V13.1.6_WIN32_X64
Efgh-1.28.1
IjKl400f-ABC-_0_1_1
mno_pqr_2002.07.03_16.29h_ab
stuv_2003.02.05_14.06h_WX_Yzab
ef-ghij-klmn-op-5.12.1-qrst-uvw
Xyzab
Defgh_1_11_0
Ijkl_mno_20100319_115358
Pqrs1679_0_1_5
tuvw++_2008.12.02_09.56h_ghe
xyz_abcd_19_3
efgh3.5.12_200603
ijkl-windows10-ver11x2_0-1.0.0
mnop-windows10_11x2ijkl-ver8.1.0.77-1.0.0
Qrst-UvWx-2.0.3+YzAbcd3.4.7

Substitution

AbCd_V13.1.6_WIN32_X64
Efgh-1.28.1
IjKl400f-ABC-_0_1_1
mno_pqr_2002.07.03_16.29h_ab
stuv_2003.02.05_14.06h_WX_Yzab
ef-ghij-klmn-op-5.12.1-qrst-uvw
Xyzab
Defgh_1_11_0
Ijkl_mno_20100319_115358
Pqrs1679_0_1_5
tuvw++_2008.12.02_09.56h_ghe
xyz_abcd_19_3
efgh3.5.12_200603
ijkl-windows10-ver11x2_0-1.0.0
mnop-windows10_11x2ijkl-ver8.1.0.77-1.0.0
Qrst-UvWx-2.0.3+YzAbcd3.4.7