Regular Expressions 101

Group 1(^|\b)

1st Alternative^

^start of line

2nd Alternative\b

\ban ASCII word boundary

Group 2([5,9]\d{2,}|\d{4,})

1st Alternative[5,9]\d{2,}

Character Class[5,9]

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

\d{2,}a digit, repeated at least 2 times

2nd Alternative\d{4,}

\d{4,}a digit, repeated at least 4 times

Group 3(\.\d+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

the literal (32₁₀ / 40₈ / 20₁₆)

Group 4(dollar|\$)

1st Alternativedollar

dollarthe literal text dollar (case sensitive)

2nd Alternative\$

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

Group 5(\b|\n)

1st Alternative\b

\ban ASCII word boundary

2nd Alternative\n

\na line-feed (newline) character (ASCII 10)

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.

Search reference

Regular Expression

(^|\b)([5,9]\d{2,}|\d{4,})(\.\d+)? (dollar|\$)(\b|\n)

501.34 dollar

500 dollar

I have 4500 dollar

1250.99 $
50000.252221121 dollar

200 dollar

350.99

I found new animal called 4500 dollariansaurus