Regular Expressions 101

^start of line

Group vendor_date(?<vendor_date>\d{4}(?:\-\d\d){2} [^,]+,[^:]+)

\d{4}a digit, repeated exactly 4 times

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

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

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\da digit

\da digit

the literal (32₁₀ / 40₈ / 20₁₆)

Negated Character Class[^,]+

+matches at least one character outside the set below:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Negated Character Class[^:]+

+matches at least one character outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group vendor_level(?<vendor_level>[^:]+)

Negated Character Class[^:]+

+matches at least one character outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group vendor_component(?<vendor_component>[^:]+)

Negated Character Class[^:]+

+matches at least one character outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Group vendor_message(?<vendor_message>[^\n\r]+)

Negated Character Class[^\n\r]+

+matches at least one character outside the set below:

\na line-feed (newline) character (ASCII 10)

\ra carriage return (ASCII 13)

Group vendor_details(?<vendor_details>(?(?=^\d{4}(?:\-\d\d){2})|[^\r])+)?

?repeats the group contents below at most once:

Condition(?(?=^\d{4}(?:\-\d\d){2})|[^\r])+

+repeats the group contents below at least once:

Uses the first branch if the lookaround matches

Positive Lookahead(?=^\d{4}(?:\-\d\d){2})

^start of line

\d{4}a digit, repeated exactly 4 times

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

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

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\da digit

\da digit

If the condition is true, match this branch: — matches an empty string

Otherwise, match this branch:[^\r]

Negated Character Class[^\r]

\ra carriage return (ASCII 13)

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

x

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Search reference

Regular Expression

^(?<vendor_date>\d{4}(?:\-\d\d){2} [^,]+,[^:]+):(?<vendor_level>[^:]+):(?<vendor_component>[^:]+):(?<vendor_message>[^\n\r]+)(?<vendor_details>(?(?=^\d{4}(?:\-\d\d){2})|[^\r])+)?

Unit Tests

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