Pattern · India 🇮🇳

Regex for ISIN (Indian)

12-char International Securities ID for Indian securities (INE/IN9 prefix).

The ISIN (Indian) regex is ^IN[EFA9][A-Z0-9]{9}\d$ — copy it below, or open it in the explainer for a token-by-token breakdown.

The pattern

^IN[EFA9][A-Z0-9]{9}\d$

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What it matches

INE002A01018
INE467B01029
IN9117A28011

What it doesn't match

US0378331005
INE002A0101
INE002A0101X

Notes & gotchas

Indian ISINs start with the country code IN. Equities use INE, debt INE/INF, mutual funds INF, government securities IN9. Issued by NSDL/CDSL. The 12-character format follows ISO 6166: country code + 9 alphanumerics + 1 check digit.

Code in your language

Use the explainer's Code tab to generate ready-to-paste snippets in JavaScript, Python, Java, .NET, Go, Ruby, and PHP for this pattern.

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Token-by-token breakdown

Every part of the pattern, left to right:

Token	Meaning
`^`	start of string (or line in multiline mode)
`IN`	literal text “IN”
`[EFA9]`	any of: “E”, “F”, “A”, “9”
`[A-Z0-9]{9}`	exactly 9 times: any of: uppercase letters, digits
`\d`	any digit (0–9)
`$`	end of string (or line in multiline mode)

About this pattern

India-specific identifiers are governed by various authorities (UIDAI for Aadhaar, Income Tax Dept for PAN, RBI for IFSC, GSTN for GSTIN, etc.). Regex confirms format; for definitive validation, integrate with the issuing authority's verification API.

Quick usage in different languages

This exact pattern — with the correct escaping and idioms for each language:

JavaScript: /^IN[EFA9][A-Z0-9]{9}\d$/.test(value)
Python: re.match(r"^IN[EFA9][A-Z0-9]{9}\d$", value)
Java: Pattern.compile("^IN[EFA9][A-Z0-9]{9}\\d$").matcher(value).matches()
C# / .NET: Regex.IsMatch(value, @"^IN[EFA9][A-Z0-9]{9}\d$")
Go: regexp.MustCompile(`^IN[EFA9][A-Z0-9]{9}\d$`).MatchString(value)
Ruby: /^IN[EFA9][A-Z0-9]{9}\d$/.match?(value)
PHP: preg_match('~^IN[EFA9][A-Z0-9]{9}\d$~', $value)

The explainer’s Code tab regenerates these for any pattern you paste, and the downloadable cheat sheet bundles the breakdown, all seven snippets, and the pitfalls below onto one printable page.

Common pitfalls

Anchored to the whole string. This pattern uses ^ and $, so it requires the entire input to match. To find it inside a longer text, drop the anchors and use the global (g) flag.
Uppercase only. Ranges like [A-Z] won't match lowercase. Add a-z (or the i flag) if lowercase input should be accepted.
Escape it correctly per language. In Java and JavaScript strings each backslash must be doubled (\\d); in Python, Go, and C# use raw/verbatim strings so the backslashes survive.
Validate beyond format. Matching the format doesn't guarantee the value is real. Confirm the isin (indian) against a source of truth (database, API, or checksum) where it matters.

Standards & sources

This pattern is based on the following authoritative specification(s) and issuing authorities. Formats can change — always confirm against the primary source.

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