regex101: US|CA dollar

^start of line

Group 1(CA|US)?

?repeats the group contents below at most once:

1st AlternativeCA

CAthe literal text CA (case sensitive)

2nd AlternativeUS

USthe literal text US (case sensitive)

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

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

Group 3(\d{0,})

\d{0,}a digit, repeated any number of times

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

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{0,}a digit, repeated any number of times

Group 5([M|B]?)

Character Class[M|B]?

?matches at most one character from the set below:

Mthe literal M (77₁₀ / 115₈ / 4D₁₆) (case sensitive)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

Bthe literal B (66₁₀ / 102₈ / 42₁₆) (case sensitive)

?repeats the group contents below at most once:

Group 7(\s| |<br\s*\/?>)*

*repeats the group contents below any number of times:

1st Alternative\s

\sany whitespace character

2nd Alternative 

 the literal text   (case sensitive)

3rd Alternative<br\s*\/?>

<brthe literal text <br (case sensitive)

\s*any whitespace character, repeated any number of times

\/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 8(\s| |<br\s*\/?>)*

*repeats the group contents below any number of times:

1st Alternative\s

\sany whitespace character

2nd Alternative 

 the literal text   (case sensitive)

3rd Alternative<br\s*\/?>

<brthe literal text <br (case sensitive)

\s*any whitespace character, repeated any number of times

\/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Group 9(MTH|QTR|Y|YEAR)

1st AlternativeMTH

MTHthe literal text MTH (case sensitive)

2nd AlternativeQTR

QTRthe literal text QTR (case sensitive)

3rd AlternativeY

Ythe literal Y (89₁₀ / 131₈ / 59₁₆) (case sensitive)

4th AlternativeYEAR

YEARthe literal text YEAR (case sensitive)

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

$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

^(CA|US)?\$((\d{0,})(\.\d{0,})?)([M|B]?)((\s|&nbsp;|<br\s*\/?>)*\/(\s|&nbsp;|<br\s*\/?>)*(MTH|QTR|Y|YEAR) ?)?$

Unit Tests

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