Regular Expressions 101

Pro

Non-Capturing Group(?:if(\W+)(\d+)-)?

?repeats the group contents below at most once:

ifthe literal text if (case sensitive)

Group 1(\W+)

\W+any character that is not a Unicode word character, repeated at least once

Group 2(\d+)

\d+a Unicode decimal digit, repeated at least once

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

\d+a Unicode decimal digit, repeated at least once

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

\d*a Unicode decimal digit, repeated any number of times

Group 4([%$])

Character Class[%$]

%the literal % (37₁₀ / 45₈ / 25₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

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.

25 tokens

(?:if(\W+)(\d+)-)?(\d+\.?\d*)([%$])

2.3%
3.5%
if>=100000-1.6%,if<100000-100$
if>=100000-1.6%,if<100000-100$
500$

2.3%
3.5%
if>=100000-1.6%,if<100000-100$
if>=100000-1.6%,if<100000-100$
500$