regex101: PCRE (Legacy) Match Workspace

^start of line

Positive Lookahead(?=(^[03]))

Group 1(^[03])

^start of line

Character Class[03]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Negative Lookahead(?!.*(\d)\2{3})

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

Group 2(\d)

\da digit

\2{3}the text saved by group 2, repeated exactly 3 times

Negative Lookahead(?!^(?:0(?=1|$))?(?:1(?=2|$))?(?:2(?=3|$))?(?:3(?=4|$))?(?:4(?=5|$))?(?:5(?=6|$))?(?:6(?=7|$))?(?:7(?=8|$))?(?:8(?=9|$))?9?$)

^start of line

Non-Capturing Group(?:0(?=1|$))?

?repeats the group contents below at most once:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Positive Lookahead(?=1|$)

1st Alternative1

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2nd Alternative$

$end of line

Non-Capturing Group(?:1(?=2|$))?

?repeats the group contents below at most once:

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Positive Lookahead(?=2|$)

1st Alternative2

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

2nd Alternative$

$end of line

Non-Capturing Group(?:2(?=3|$))?

?repeats the group contents below at most once:

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Positive Lookahead(?=3|$)

1st Alternative3

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

2nd Alternative$

$end of line

Non-Capturing Group(?:3(?=4|$))?

?repeats the group contents below at most once:

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Positive Lookahead(?=4|$)

1st Alternative4

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

2nd Alternative$

$end of line

Non-Capturing Group(?:4(?=5|$))?

?repeats the group contents below at most once:

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

Positive Lookahead(?=5|$)

1st Alternative5

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

2nd Alternative$

Non-Capturing Group(?:5(?=6|$))?

Non-Capturing Group(?:6(?=7|$))?

Non-Capturing Group(?:7(?=8|$))?

Non-Capturing Group(?:8(?=9|$))?

9?optionally matches the literal 9 (57₁₀ / 71₈ / 39₁₆)

$end of line

\d{7,11}a digit, repeated between 7 and 11 times

$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

^(?=(^[03]))(?!.*(\d)\2{3})(?!^(?:0(?=1|$))?(?:1(?=2|$))?(?:2(?=3|$))?(?:3(?=4|$))?(?:4(?=5|$))?(?:5(?=6|$))?(?:6(?=7|$))?(?:7(?=8|$))?(?:8(?=9|$))?9?$)\d{7,11}$

New

Substitution