regex101: PCRE2 (PHP) Match Workspace

Pro

^start of line

Positive Lookahead(?=(?P<LE10>(?:0[0-9]|1[0-9]|2[0-8]|3[0-7]|4[0-6]|5[0-5]|6[0-4]|7[0-3]|8[0-2]|9[0-1])))?

?repeats the group contents below at most once:

Group LE10(?P<LE10>(?:0[0-9]|1[0-9]|2[0-8]|3[0-7]|4[0-6]|5[0-5]|6[0-4]|7[0-3]|8[0-2]|9[0-1]))

Non-Capturing Group(?:0[0-9]|1[0-9]|2[0-8]|3[0-7]|4[0-6]|5[0-5]|6[0-4]|7[0-3]|8[0-2]|9[0-1])

1st Alternative0[0-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[0-9]

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

2nd Alternative1[0-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

3rd Alternative2[0-8]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-8]

0-8one character from 0 (48₁₀) to 8 (56₁₀)

4th Alternative3[0-7]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0-7]

0-7one character from 0 (48₁₀) to 7 (55₁₀)

5th Alternative4[0-6]

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

Character Class[0-6]

0-6one character from 0 (48₁₀) to 6 (54₁₀)

6th Alternative5[0-5]

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

Character Class[0-5]

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

7th Alternative6[0-4]

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

Character Class[0-4]

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

8th Alternative7[0-3]

7the literal 7 (55₁₀ / 67₈ / 37₁₆)

Character Class[0-3]

0-3one character from 0 (48₁₀) to 3 (51₁₀)

9th Alternative8[0-2]

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

Character Class[0-2]

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

10th Alternative9[0-1]

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

Character Class[0-1]

0-1one character from 0 (48₁₀) to 1 (49₁₀)

Non-Capturing Group(?:(?:X|(?P>LE10))-){9}

{9}repeats the group contents below exactly 9 times:

Non-Capturing Group(?:X|(?P>LE10))

1st AlternativeX

2nd Alternative(?P>LE10)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:XXX|XX\d|X?(?P>LE10)|(?:19|28|37|46|55|64|7|3|82|91)[X\d])

$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

^(?=(?P<LE10>(?:0[0-9]|1[0-9]|2[0-8]|3[0-7]|4[0-6]|5[0-5]|6[0-4]|7[0-3]|8[0-2]|9[0-1])))?(?:(?:X|(?P>LE10))-){9}(?:XXX|XX\d|X?(?P>LE10)|(?:19|28|37|46|55|64|7|3|82|91)[X\d])$

Unit Tests

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