Regular Expressions 101

^start of line

Character Class[[:alnum:]]+

+matches at least one character from the set below:

[:alnum:]an alphanumeric character [a-zA-Z0-9]

Non-Capturing Group(?:_\d+){2}

{2}repeats the group contents below exactly 2 times:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\d+a digit, repeated at least once

Non-Capturing Group(?:\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

Non-Capturing Group(?:\|[[:alnum:]]+(?:_\d+){2}(?:\.\d+)?)*

*repeats the group contents below any number of times:

\|the literal | (124₁₀ / 174₈ / 7C₁₆)

Character Class[[:alnum:]]+

+matches at least one character from the set below:

[:alnum:]an alphanumeric character [a-zA-Z0-9]

Non-Capturing Group(?:_\d+){2}

{2}repeats the group contents below exactly 2 times:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\d+a digit, repeated at least once

Non-Capturing Group(?:\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

$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

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25 tokens

Regular Expression

^[[:alnum:]]+(?:_\d+){2}(?:\.\d+)?(?:\|[[:alnum:]]+(?:_\d+){2}(?:\.\d+)?)*$

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