Regular Expressions 101

Non-Capturing Group(?: 0(?=1|\b)| 1(?=2|\b)| 2(?=3|\b)| 3(?=4|\b)| 4(?=5|\b)| 5(?=6|\b)| 6(?=7|\b)| 7(?=8|\b)| 8(?=9|\b)| 9\b ){5}

{5}repeats the group contents below exactly 5 times:

1st Alternative 0(?=1|\b)

0the literal text 0

Positive Lookahead(?=1|\b)

1st Alternative1

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2nd Alternative\b

\ban ASCII word boundary

2nd Alternative 1(?=2|\b)

1the literal text 1

Positive Lookahead(?=2|\b)

1st Alternative2

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

2nd Alternative\b

\ban ASCII word boundary

3rd Alternative 2(?=3|\b)

2the literal text 2

Positive Lookahead(?=3|\b)

1st Alternative3

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

2nd Alternative\b

\ban ASCII word boundary

4th Alternative 3(?=4|\b)

3the literal text 3

Positive Lookahead(?=4|\b)

1st Alternative4

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

2nd Alternative\b

\ban ASCII word boundary

5th Alternative 4(?=5|\b)

4the literal text 4

Positive Lookahead(?=5|\b)

1st Alternative5

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

2nd Alternative\b

\ban ASCII word boundary

6th Alternative 5(?=6|\b)

5the literal text 5

Positive Lookahead(?=6|\b)

1st Alternative6

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

2nd Alternative\b

\ban ASCII word boundary

7th Alternative 6(?=7|\b)

8th Alternative 7(?=8|\b)

9th Alternative 8(?=9|\b)

10th Alternative 9\b

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?: 0(?=1|\b)| 1(?=2|\b)| 2(?=3|\b)|  3(?=4|\b)|  4(?=5|\b)|  5(?=6|\b)|  6(?=7|\b)|  7(?=8|\b)|  8(?=9|\b)|  9\b  ){5}

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