Regular Expressions 101

Pro

^start of line

Character Class[1-9]

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

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

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

Group 2([0-9]{0,2}(\.[0-9]{3})*)

Character Class[0-9]{0,2}

{0,2}matches between 0 and 2 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Group 3(\.[0-9]{3})*

*repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]{3}

{3}matches exactly 3 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

2nd Alternative[0-9]*

Character Class[0-9]*

*matches any number of characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

$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.

25 tokens

Regular Expression

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

New

---- válidos
1
12
123
1.100
123.123
2.321.234.556.654
---- válidos sem o ponto separando os milhares (caso seja aceito)
12345
1100
---- inválidos
1.1
1.2345
0
012
....