regex101: JavaScript Match Workspace

^start of line

Negative Lookahead(?!.*?_.*?)

.*?any character (except for line terminators), repeated any number of times

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

.*?any character (except for line terminators), repeated any number of times

Negative Lookahead(?!(?:[\d\w]+?\.)?\-[\w\d\.\-]*?)

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

?repeats the group contents below at most once:

Character Class[\d\w]+?

+?matches at least one character from the set below:

\da digit

\wany word character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[\w\d\.\-]*?

*?matches any number of characters from the set below:

\wany word character

\da digit

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookahead(?![\w\d]+?\-\.(?:[\d\w\.\-]+?))

Character Class[\w\d]+?

+?matches at least one character from the set below:

\wany word character

\da digit

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

Character Class[\d\w\.\-]+?

+?matches at least one character from the set below:

\da digit

\wany word character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Positive Lookahead(?=[\w\d])

Character Class[\w\d]

\wany word character

\da digit

Positive Lookahead(?=[\w\d\.\-]*?\.+[\w\d\.\-]*?)

Character Class[\w\d\.\-]*?

*?matches any number of characters from the set below:

\wany word character

\da digit

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.+the literal . (46₁₀ / 56₈ / 2E₁₆) , repeated at least once

Character Class[\w\d\.\-]*?

*?matches any number of characters from the set below:

\wany word character

\da digit

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookahead(?![\w\d\.\-]{254})

Character Class[\w\d\.\-]{254}

{254}matches exactly 254 characters from the set below:

\wany word character

\da digit

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookahead(?!(?:\.?[\w\d\-\.]*?[\w\d\-]{64,}\.)+?)

Non-Capturing Group(?:\.?[\w\d\-\.]*?[\w\d\-]{64,}\.)+?

+?repeats the group contents below at least once:

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\w\d\-\.]*?

*?matches any number of characters from the set below:

\wany word character

\da digit

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\w\d\-]{64,}

{64,}matches at least 64 characters from the set below:

\wany word character

\da digit

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\w\d\.\-]+?

+?matches at least one character from the set below:

\wany word character

\da digit

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookbehind(?<![\w\d\-\.]*?\.[\d]+?)

Character Class[\w\d\-\.]*?

*?matches any number of characters from the set below:

\wany word character

\da digit

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\d]+?

+?matches at least one character from the set below:

\da digit

Positive Lookbehind(?<=[\w\d\-]{2,})

Character Class[\w\d\-]{2,}

Negative Lookbehind(?<![\w\d\-]{25})

$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

Search reference

Regular Expression

^(?!.*?_.*?)(?!(?:[\d\w]+?\.)?\-[\w\d\.\-]*?)(?![\w\d]+?\-\.(?:[\d\w\.\-]+?))(?=[\w\d])(?=[\w\d\.\-]*?\.+[\w\d\.\-]*?)(?![\w\d\.\-]{254})(?!(?:\.?[\w\d\-\.]*?[\w\d\-]{64,}\.)+?)[\w\d\.\-]+?(?<![\w\d\-\.]*?\.[\d]+?)(?<=[\w\d\-]{2,})(?<![\w\d\-]{25})$

Unit Tests

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