Regular Expressions 101

Explanation

Pro

^start of line

Group 1(\[(\d+|(?:\d*\.\d+))(?:,\s*(\d+|(?:\d*\.\d+)))*\])

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group 2(\d+|(?:\d*\.\d+))

1st Alternative\d+

\d+a digit, repeated at least once

2nd Alternative(?:\d*\.\d+)

Non-Capturing Group(?:\d*\.\d+)

\d*a digit, repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

Non-Capturing Group(?:,\s*(\d+|(?:\d*\.\d+)))*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

Group 3(\d+|(?:\d*\.\d+))

1st Alternative\d+

\d+a digit, repeated at least once

2nd Alternative(?:\d*\.\d+)

Non-Capturing Group(?:\d*\.\d+)

\d*a digit, repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

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

Character Class[\*x]

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case sensitive)

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

Group 4(\[(\d+|(?:\d*\.\d+))(?:,\s*(\d+|(?:\d*\.\d+)))*\])

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group 5(\d+|(?:\d*\.\d+))

1st Alternative\d+

\d+a digit, repeated at least once

2nd Alternative(?:\d*\.\d+)

Non-Capturing Group(?:\d*\.\d+)

\d*a digit, repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

Non-Capturing Group(?:,\s*(\d+|(?:\d*\.\d+)))*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

Group 6(\d+|(?:\d*\.\d+))

1st Alternative\d+

\d+a digit, repeated at least once

2nd Alternative(?:\d*\.\d+)

Non-Capturing Group(?:\d*\.\d+)

\d*a digit, repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

$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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

26 tokens

Regular Expression

^(\[(\d+|(?:\d*\.\d+))(?:,\s*(\d+|(?:\d*\.\d+)))*\])\s*[\*x]\s*(\[(\d+|(?:\d*\.\d+))(?:,\s*(\d+|(?:\d*\.\d+)))*\])$

[0]*[1]
[2,3]*[4,5]
[6, 7, 8] * [9, 10, 11]
[12,13, 14]* [15, 16,17]
[0]x[1]
[2,3]x[4,5]
[6, 7, 8] x [9, 10, 11]
[12,13, 14]x [15, 16,17]

[1.2, 3, 4.5] x [6, 7.8, 9]

Substitution

[0]*[1]
[2,3]*[4,5]
[6, 7, 8] * [9, 10, 11]
[12,13, 14]* [15, 16,17]
[0]x[1]
[2,3]x[4,5]
[6, 7, 8] x [9, 10, 11]
[12,13, 14]x [15, 16,17]

[1.2, 3, 4.5] x [6, 7.8, 9]