regex101: PCRE (Legacy) Match Workspace

^start of line

Group 1(ABC)

ABCthe literal text ABC (case sensitive)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 2([0-9]{4})

Character Class[0-9]{4}

{4}matches exactly 4 characters from the set below:

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 3([0-9]+\.[0-9]+\.[0-9]+)

Character Class[0-9]+

+matches at least one character from the set below:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

Non-Capturing Group(?:(_[a-zA-Z]+)(|_[a-zA-Z]+))?

?repeats the group contents below at most once:

Group 4(_[a-zA-Z]+)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Character Class[a-zA-Z]+

+matches at least one character from the set below:

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

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

Group 5(|_[a-zA-Z]+)

1st Alternative — matches an empty string

2nd Alternative_[a-zA-Z]+

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Character Class[a-zA-Z]+

+matches at least one character from the set below:

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

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

xyzthe literal text xyz (case sensitive)

$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

^(ABC)_([0-9]{4})_([0-9]+\.[0-9]+\.[0-9]+)(?:(_[a-zA-Z]+)(|_[a-zA-Z]+))?\.xyz$

New

ABC_0000_0.0.0.xyz
Group 1  : ABC
Group 2  : 0000
Group 3  : 0.0.0
Group 4  : <empty>
Group 5  : <empty>
ABC_0001_0.1.0_N.xyz
Group 1  : ABC
Group 2  : 0001
Group 3  : 0.1.0
Group 4  : _N
Group 5  : <empty>

ABC_0002_1.1.2_foo.xyz
Group 1  : ABC
Group 2  : 0002
Group 3  : 1.1.2
Group 4  : <empty>
Group 5  : _foo

ABC_0002_42.42.42_N_bar.xyz
Group 1  : ABC
Group 2  : 0002
Group 3  : 42.42.42
Group 4  : _N
Group 5  : _bar