Download How to Match decimal numbers and currency in Regex.mp4
Here’s a simple and easy explanation of how to match decimal numbers and currency values using Regex, along with clear examples.
✔️ Matching Decimal Numbers & Currency in Regex
🟦 1. Matching Decimal Numbers
Decimal numbers are numbers that may have a decimal point.
Examples:
12
12.5
0.99
.75
150.00
✅ Basic Regex for Decimal Numbers
\d+(\.\d+)?
✔️ Explanation
-
\d+ → one or more digits
-
(.\d+)? → optional decimal part
-
\.→ the dot -
\d+→ digits after the dot -
?→ the whole decimal part is optional
-
✔️ Matches
-
12 -
12.5 -
150.00
❌ Does NOT match
-
.75(because it requires digits before the dot)
🟦 2. Matching Decimals With Optional Leading Zero
If you want to allow numbers like .75, use this:
✅ Regex
\d*(\.\d+)?
✔️ Matches
-
.75 -
0.75 -
12.9 -
12
🟦 3. Allowing Either Integer or Decimal, but Not Empty
This is often used in real applications.
You want either:
-
digits only →
45 -
digits + decimals →
45.90 -
dot + decimals →
.90
✅ Better Regex
\d+(\.\d+)?|\.\d+
🟦 4. Matching Currency Values (₹, $, €, etc.)
Currency usually has:
-
Symbol →
$,₹,€,£ -
Decimal part with exactly 2 digits →
.00,.50,.99 -
Optional commas →
1,000.50
Examples:
$10.99
₹1,200.00
€0.50
£99
✔️ 4.1 Currency With Symbol & Optional Decimal
✅ Regex
[$₹€£]\d+(\.\d{2})?
✔️ Explanation
-
[$₹€£]→ matches one symbol -
\d+→ the number -
(\.\d{2})?→ optional.00decimal part with 2 digits
✔️ Matches
-
$10 -
$10.99 -
₹50.00 -
€9.50
✔️ 4.2 Currency With Commas (1,000.00)
✅ Regex
[$₹€£]\d{1,3}(,\d{3})*(\.\d{2})?
✔️ Explanation
-
\d{1,3} → first group (1–3 digits)
-
(,\d{3})* → optional groups of
,000 -
(.\d{2})? → optional decimal part
✔️ Matches
-
$1,000.00 -
₹25,50,000.99(Indian numbering also works depending on format) -
€999.50
🟩 5. Currency Without Symbol (just numbers like 10.99)
If you want to match only valid currency decimals, exactly 2 digits:
✅ Regex
\d+(\.\d{2})?
✔️ Matches:
-
10 -
10.99
❌ Does NOT match:
-
10.9 -
10.999
🟩 6. Complete Universal Regex
Match currency numbers with optional:
-
symbol
-
commas
-
decimals
✅ Universal Regex
([$₹€£])?\d{1,3}(,\d{3})*(\.\d{2})?
🎉 Summary (Super Simple)
| Purpose | Regex |
|---|---|
| Basic decimal | \d+(\.\d+)? |
Allow .75 |
\d*(\.\d+)? |
| Currency with symbol | [$₹€£]\d+(\.\d{2})? |
| Currency with commas | [$₹€£]\d{1,3}(,\d{3})*(\.\d{2})? |
| Strict 2-decimal currency | \d+(\.\d{2})? |
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