regex101: Numbers

^start of line

Group 1(([1-9]\d{0,2}((,\d{3})*|(\d{3})*))|0?)

1st Alternative([1-9]\d{0,2}((,\d{3})*|(\d{3})*))

Group 2([1-9]\d{0,2}((,\d{3})*|(\d{3})*))

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

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

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

1st Alternative(,\d{3})*

Group 4(,\d{3})*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

2nd Alternative(\d{3})*

Group 5(\d{3})*

*repeats the group contents below any number of times:

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

2nd Alternative0?

0?optionally matches the literal 0 (48₁₀ / 60₈ / 30₁₆)

Group 6(\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\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

Search reference

Regular Expression

^(([1-9]\d{0,2}((,\d{3})*|(\d{3})*))|0?)(\.\d+)?$

New

Capture the following numbers
1
0
1223
332243243423243243243423423243
12
1000000000
111,000,000
1000.000398
1,123,333.2222222
1.22222222
1,234,345,673,345,345,345.123455
1222222222

0.123345

.1234
012,312
.12332
1000.122.122
1,231,423,434.3746472773640000000000
Don't Capture:
2000..0000

,111.45

start of line
#first is 1 - 3 digits
	# can't start with zero 
	# unless the zero is followed by a period
#then optional (optional comma then 3 digits)
#then optional (period then unlimited digits) 
end of line

Regular Expressions 101

Regular Expression

Extraction