Regular Expressions 101

^start of string

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

Character Class[1-9]

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

Character Class[0-9]*

*matches any number of characters from the set below:

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

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

Positive Lookahead(?=([., \t]))

Group 1([., \t])

Character Class[., \t]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

Non-Capturing Group(?:\s*(?:\1|\r?\n)\s*[1-9][0-9]*)+

+repeats the group contents below at least once:

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

Non-Capturing Group(?:\1|\r?\n)

1st Alternative\1

\1the text saved by group 1

2nd Alternative\r?\n

\r?optionally matches a carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

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

Character Class[1-9]

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

Character Class[0-9]*

*matches any number of characters from the set below:

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

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

$end of string, or before its final line terminator

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^\s*[1-9][0-9]*\s*(?=([., \t]))(?:\s*(?:\1|\r?\n)\s*[1-9][0-9]*)+\s*$

New

10 , 11 , 12 , 13 , 14 , 30
 , 9 , 41 , 42 , 44 , 46 , 48
10 , 11 , 12 ,13 , 14 , 30