Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A single character of: a, b, c or d
    [[ab][cd]]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Character class intersection
    [\w&&[^\d]]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

"
"
g

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"\w{0,10}((?i)(access.{0,1}key)|(access.{0,1}token)|(access.{0,1}id)|(secret.{0,1}key)|(secret.{0,1}token)|(api.{0,1}key)|(api.{0,1}secret)|(sign.{0,1}in)|(credential[A-Za-z0-9_\-]{0,22})|ak|sk|akid|skid|auth|authentication|certificate|cookie|session|passwd|password|private|token|salt|secretid|accesskeyid|access_key_id|上线|发布|部署|令牌|凭证|口令|密码|密钥|登录|登陆|私钥|秘钥|认证|证书|帐号|账号|账密|配置|鉴权|验证|数据库|用户名|访问码|账号管理)\s*[=:]\s*\""[A-Za-z0-9_\-]{6,33}\"" "; string input = @"accesskey: ""123456pwd"" accessKey: ""123456pwd"" AccessKey: ""123456pwd"" access key: ""123456pwd"" access_key: ""123456pwd"" secretkey: ""123456pwd"" secretKey: ""123456pwd"" SecretKey: ""123456pwd"" secret key: ""123456pwd"" secret_key: ""123456pwd"" ak: ""123456pwd"" sk: ""123456pwd"" CredentialAzureAccessKey: ""123456pwd"" CredentialKeyAli: ""123456pwd"" CredentialKeyKingsoft: ""123456pwd"" CredentialKeyTencent: ""123456pwd"" CredentialSecretAli: ""123456pwd"" CredentialSecretKingsoft: ""123456pwd"" CredentialSecretTencent: ""123456pwd"" CredentialUcloudPrivateKey: ""123456pwd"" CredentialUcloudPublicKey: ""123456pwd"" CredentialXingyuAccessKey: ""123456pwd"" CredentialXingyuAccessSecret: ""123456pwd"" Dockerfile: ""123456pwd"" AkamaiAccessToken: ""123456pwd"" AkamaiClientSecret: ""123456pwd"" AkamaiClientToken: ""123456pwd"" AwsSecretId: ""123456pwd"" AwsSecretKey: ""123456pwd"" AzureSubscriptionId: ""123456pwd"" CredentialAzureAccessKey: ""123456pwd"" CredentialKeyAli: ""123456pwd"" CredentialKeyKingsoft: ""123456pwd"" CredentialKeyTencent: ""123456pwd"" CredentialSecretAli: ""123456pwd"" CredentialSecretKingsoft: ""123456pwd"" CredentialSecretTencent: ""123456pwd"" CredentialUcloudPrivateKey: ""123456pwd"" CredentialUcloudPublicKey: ""123456pwd"" CredentialXingyuAccessKey: ""123456pwd"" CredentialXingyuAccessSecret: ""123456pwd"" 1. Access Key 相关：: ""123456pwd"" - Access Key: ""123456pwd"" - AccessKey: ""123456pwd"" - Access_Key: ""123456pwd"" - AccessKeyID: ""123456pwd"" - AccessKeyId: ""123456pwd"" - Access_Key_ID: ""123456pwd"" - AK: ""123456pwd"" - AKID: ""123456pwd"" 2. Secret Key 相关：: ""123456pwd"" - Secret Key: ""123456pwd"" - SecretKey: ""123456pwd"" - Secret_Key: ""123456pwd"" - SecretAccessKey: ""123456pwd"" - Secret_Access_Key: ""123456pwd"" - SK: ""123456pwd"" - Secret: ""123456pwd"" 3. Access Token 相关：: ""123456pwd"" - Access Token: ""123456pwd"" - AccessToken: ""123456pwd"" - Token: ""123456pwd"" - AuthToken: ""123456pwd"" - Bearer Token: ""123456pwd"" - Refresh Token: ""123456pwd"" 1. 账号相关：: ""123456pwd"" - Username: ""123456pwd"" - User: ""123456pwd"" - Account: ""123456pwd"" - Login: ""123456pwd"" - Email: ""123456pwd"" - UserID: ""123456pwd"" - 用户名: ""123456pwd"" - 账户: ""123456pwd"" 2. 密码相关：: ""123456pwd"" - Password: ""123456pwd"" - Pass: ""123456pwd"" - Pwd: ""123456pwd"" - 密码: ""123456pwd"" - 口令: ""123456pwd"" - 访问码: ""123456pwd"" 3. 登录相关：: ""123456pwd"" - Signin: ""123456pwd"" - Sign in: ""123456pwd"" - Sign-in: ""123456pwd"" - 登录: ""123456pwd"" - 登陆: ""123456pwd"" - 登入: ""123456pwd"" 4. 认证相关：: ""123456pwd"" - Authentication: ""123456pwd"" - Auth: ""123456pwd"" - 认证: ""123456pwd"" - 鉴权: ""123456pwd"" - 验证: ""123456pwd"" 5. 凭证相关：: ""123456pwd"" - Credential: ""123456pwd"" - Credentials: ""123456pwd"" - 凭证: ""123456pwd"" - 证书: ""123456pwd"" - 令牌: ""123456pwd"" "; foreach (Match m in Regex.Matches(input, pattern)) { Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index); } } }

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx