Regular Expressions 101

Negative Lookahead(?!\s)

\sany whitespace character

Group 1((\d*\.?\d*)*|([+*^\.\-])*?)?

?repeats the group contents below at most once:

1st Alternative(\d*\.?\d*)*

Group 2(\d*\.?\d*)*

*repeats the group contents below any number of times:

\d*a digit, repeated any number of times

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

\d*a digit, repeated any number of times

2nd Alternative([+*^\.\-])*?

Group 3([+*^\.\-])*?

*?repeats the group contents below any number of times:

Character Class[+*^\.\-]

+the literal + (43₁₀ / 53₈ / 2B₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

(?!\s)((\d*\.?\d*)*|([+*^\.\(\)\-])*?)?

New

This one works for value.match() in JS
/(?!\s)(([+\-*^()])|(\d*\.?\d*)*)/gm

The one in the bar shows how it collects the values

7 + 5
7+ 5
7 +5
5   + 7
6 * 5
6 ^ 5
6 - 5
(60 + 5) * 4
( 70 + 5) + 4
+4
*657
(*6)
7.6656
( 6.54 + 5) * 33.4
+-^*()00

Regular Expression

Extraction