Regular Expressions 101

Character Class[0-9]

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

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

Non-Capturing Group(?:[+-][+-]|\*/)

1st Alternative[+-][+-]

Character Class[+-]

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[+-]

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

2nd Alternative\*/

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

Character Class[0-9]

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

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.

Search reference

Regular Expression

[0-9]\s*(?:[+-][+-]|\*/)\s*[0-9]

This is test 1 -- 1
This is test 2
This is test 3 + 1
This is test 4 */ 4