Regular Expressions 101

^start of line

\d{3}a digit, repeated exactly 3 times

Non-Capturing Group(?:-\d{3})?

?repeats the group contents below at most once:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{3}a digit, repeated exactly 3 times

Non-Capturing Group(?:\s*(?:,|and|or)\s*\d{3}(?:-\d{3})?)*

*repeats the group contents below any number of times:

\s*any whitespace character, repeated any number of times

Non-Capturing Group(?:,|and|or)

1st Alternative,

,the literal , (44₁₀ / 54₈ / 2C₁₆)

2nd Alternativeand

andthe literal text and (case sensitive)

3rd Alternativeor

orthe literal text or (case sensitive)

\s*any whitespace character, repeated any number of times

\d{3}a digit, repeated exactly 3 times

Non-Capturing Group(?:-\d{3})?

?repeats the group contents below at most once:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{3}a digit, repeated exactly 3 times

Positive Lookahead(?=,|$)

1st Alternative,

,the literal , (44₁₀ / 54₈ / 2C₁₆)

2nd Alternative$

$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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^\d{3}(?:-\d{3})?(?:\s*(?:,|and|or)\s*\d{3}(?:-\d{3})?)*(?=,|$)

New

345
346-348
234,235,236,237-239
234, 235, 236, 237-239
234,234, 236 and 237-239
234,234, 236 or 237-239

3454
454,4567 (match only 454)