regex101: Us Currency Format with Length Limitation

1st Alternative(?!^\$0[1-9])(?=^(\$[0-9]+(\,[0-9]{3})*)+(\.[0-9]+)?$)^.{1,19}$

Negative Lookahead(?!^\$0[1-9])

^start of string

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

Positive Lookahead(?=^(\$[0-9]+(\,[0-9]{3})*)+(\.[0-9]+)?$)

^start of string

Group 1(\$[0-9]+(\,[0-9]{3})*)+

+repeats the group contents below at least once:

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

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

*repeats the group contents below any number of times:

\,the literal , (44₁₀ / 54₈ / 2C₁₆)

Character Class[0-9]{3}

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

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

Group 3(\.[0-9]+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

$end of string, or before its final line terminator

^start of string

.{1,19}any character (except for line terminators), repeated between 1 and 19 times

$end of string, or before its final line terminator

2nd Alternative(?!^0[1-9])(?=^([0-9]+(\,[0-9]{3})*)+(\.[0-9]+)?$)^.{1,18}$

Negative Lookahead(?!^0[1-9])

^start of string

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[1-9]

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

Positive Lookahead(?=^([0-9]+(\,[0-9]{3})*)+(\.[0-9]+)?$)

^start of string

Group 4([0-9]+(\,[0-9]{3})*)+

+repeats the group contents below at least once:

Character Class[0-9]+

+matches at least one character from the set below:

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

Group 5(\,[0-9]{3})*

*repeats the group contents below any number of times:

\,the literal , (44₁₀ / 54₈ / 2C₁₆)

Character Class[0-9]{3}

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

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

Group 6(\.[0-9]+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

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

$end of string, or before its final line terminator

^start of string

.{1,18}any character (except for line terminators), repeated between 1 and 18 times

$end of string, or before its final line terminator

Search reference

Regular Expression

(?!^\$0[1-9])(?=^(\$[0-9]+(\,[0-9]{3})*)+(\.[0-9]+)?$)^.{1,19}$|(?!^0[1-9])(?=^([0-9]+(\,[0-9]{3})*)+(\.[0-9]+)?$)^.{1,18}$

Test String
New

$1,122,222.222

Regular Expressions 101

Regular Expression

Test String
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Substitution
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Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
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