Regular Expressions 101

^start of line

Character Class[+-]?

?matches at most one character from the set below:

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d*a digit, repeated any number of times

\.*the literal . (46₁₀ / 56₈ / 2E₁₆) , repeated any number of times

\d+a digit, repeated at least once

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

*repeats the group contents below any number of times:

Character Class[+*\/-]

+the literal + (43₁₀ / 53₈ / 2B₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[+-]?

?matches at most one character from the set below:

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d*a digit, repeated any number of times

\.*the literal . (46₁₀ / 56₈ / 2E₁₆) , repeated any number of times

\d+a digit, repeated at least once

$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

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Search reference

Regular Expression

^[+-]?\d*\.*\d+(?:[+*\/-][+-]?\d*\.*\d+)*$

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