Pattern · India 🇮🇳

Regex for CDSL Demat account

16-digit CDSL demat account — all numeric, starts with DP ID.

The CDSL Demat account regex is ^\d{16}$ — copy it below, or open it in the explainer for a token-by-token breakdown.

The pattern

^\d{16}$

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What it matches

1234567890123456
1208870098765432

What it doesn't match

IN30012345678901
123456789012345
12345678901234567

Notes & gotchas

CDSL demat accounts are 16 numeric digits: 8-digit DP ID + 8-digit client ID (or various splits depending on DP). Unlike NSDL, no "IN" prefix. Issued by DPs registered with CDSL (Central Depository Services Limited).

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)
`\d{16}`	exactly 16 times: 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: /^\d{16}$/.test(value)
Python: re.match(r"^\d{16}$", value)
Java: Pattern.compile("^\\d{16}$").matcher(value).matches()
C# / .NET: Regex.IsMatch(value, @"^\d{16}$")
Go: regexp.MustCompile(`^\d{16}$`).MatchString(value)
Ruby: /^\d{16}$/.match?(value)
PHP: preg_match('~^\d{16}$~', $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.
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 cdsl demat account 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.

Securities and Exchange Board of India (SEBI)

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