Regular Expressions 101

^start of line

Non-Capturing Group(?:[$](\s{0,1})|)

1st Alternative[$](\s{0,1})

Character Class[$]

$the literal $ (36₁₀ / 44₈ / 24₁₆)

Group 1(\s{0,1})

\s{0,1}optionally matches any whitespace character

2nd Alternative — matches an empty string

Character Class[+-]?

?matches at most one character from the set below:

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 2(\d{1,3},?(\d{3},?)*\d{3}(\.\d{0,2})?|\d{1,3}(\.\d{0,2})?|\.\d{1,2}?)

1st Alternative\d{1,3},?(\d{3},?)*\d{3}(\.\d{0,2})?

\d{1,3}a digit, repeated between 1 and 3 times

,?optionally matches the literal , (44₁₀ / 54₈ / 2C₁₆)

Group 3(\d{3},?)*

*repeats the group contents below any number of times:

\d{3}a digit, repeated exactly 3 times

,?optionally matches the literal , (44₁₀ / 54₈ / 2C₁₆)

\d{3}a digit, repeated exactly 3 times

Group 4(\.\d{0,2})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{0,2}a digit, repeated between 0 and 2 times

2nd Alternative\d{1,3}(\.\d{0,2})?

\d{1,3}a digit, repeated between 1 and 3 times

Group 5(\.\d{0,2})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{0,2}a digit, repeated between 0 and 2 times

3rd Alternative\.\d{1,2}?

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{1,2}?a digit, repeated between 1 and 2 times

$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

Detailed match information will be displayed here automatically.

26 tokens

Regular Expression

^(?:[$](\s{0,1})|)[+-]?(\d{1,3},?(\d{3},?)*\d{3}(\.\d{0,2})?|\d{1,3}(\.\d{0,2})?|\.\d{1,2}?)$

New

//OK TESTS
0.12
2,000,000.00
$1.23
$ 1.23
-1233
$ -123
$-123

.12
$ .12
$-.12

//NEGATIVE TESTS
12.123
3.3.3
.2.2.
$$123.11
$12.$123
$  123.2
.00.00
.0.0
...0