regex101: PCRE2 (PHP) Match Workspace

^start of line

\ban ASCII word boundary

Group 1(0|[1-9][0-9]{0,3}|[1-5][0-9]{4}|6[0-4][0-9]{3}|65[0-4][0-9]{2}|655[0-2][0-9]|6553[0-5])

1st Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative[1-9][0-9]{0,3}

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Character Class[0-9]{0,3}

{0,3}matches between 0 and 3 characters from the set below:

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

3rd Alternative[1-5][0-9]{4}

Character Class[1-5]

1-5one character from 1 (49₁₀) to 5 (53₁₀)

Character Class[0-9]{4}

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

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

4th Alternative6[0-4][0-9]{3}

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

Character Class[0-4]

0-4one character from 0 (48₁₀) to 4 (52₁₀)

Character Class[0-9]{3}

{3}matches exactly 3 characters from the set below:

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

5th Alternative65[0-4][0-9]{2}

65the literal text 65

Character Class[0-4]

0-4one character from 0 (48₁₀) to 4 (52₁₀)

Character Class[0-9]{2}

{2}matches exactly 2 characters from the set below:

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

6th Alternative655[0-2][0-9]

655the literal text 655

Character Class[0-2]

0-2one character from 0 (48₁₀) to 2 (50₁₀)

Character Class[0-9]

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

7th Alternative6553[0-5]

6553the literal text 6553

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

\ban ASCII word boundary

\hany horizontal whitespace character

Group 2(\.|\b((?=.{1,255}$)(?:xn\-\-)?(?!-)(?!.*--)[a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?(?:\.[a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?)*\.?)\b)

1st Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternative\b((?=.{1,255}$)(?:xn\-\-)?(?!-)(?!.*--)[a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?(?:\.[a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?)*\.?)\b

\ban ASCII word boundary

Group 3((?=.{1,255}$)(?:xn\-\-)?(?!-)(?!.*--)[a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?(?:\.[a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?)*\.?)

Positive Lookahead(?=.{1,255}$)

.{1,255}any character (except for line terminators), repeated between 1 and 255 times

$end of line

Non-Capturing Group(?:xn\-\-)?

?repeats the group contents below at most once:

xnthe literal text xn (case sensitive)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookahead(?!-)

Negative Lookahead(?!.*--)

Character Class[a-z0-9]

Group 4([a-z0-9-]{0,61}[a-z0-9])?

Non-Capturing Group(?:\.[a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?)*

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

\ban ASCII word boundary

Non-Capturing Group(?:\.)?

Negative Lookahead(?!=)

Group 6(\h(([a-z0-9-]{1,63})((\=\")[\x21\x23-\x27\x2A-\x3A\x3C-\x7E]{1,255}+(\"))?)?)*?

$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

^\b(0|[1-9][0-9]{0,3}|[1-5][0-9]{4}|6[0-4][0-9]{3}|65[0-4][0-9]{2}|655[0-2][0-9]|6553[0-5])\b\h(\.|\b((?=.{1,255}$)(?:xn\-\-)?(?!-)(?!.*--)[a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?(?:\.[a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?)*\.?)\b)(?:\.)?(?!=)(\h(([a-z0-9-]{1,63})((\=\")[\x21\x23-\x27\x2A-\x3A\x3C-\x7E]{1,255}+(\"))?)?)*?$

Unit Tests

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