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Mastering Lookaheads and Lookbehinds for Complex String Assertions

Mastering Lookaheads and Lookbehinds for Complex String Assertions

Positive assertion (?=...), negative assertion (?!...), positive assertion (??

Aug 04, 2025 am 06:35 AM
PHP Regular Expressions
Java Security Best Practices for Enterprise Applications

Java Security Best Practices for Enterprise Applications

Verify all inputs and use precompiled statements to prevent SQL injection, use OWASP JavaEncoder to defend against XSS, and implement whitelist verification; 2. Use tools such as OWASPDependency-Check to scan dependencies regularly, update third-party libraries in a timely manner, minimize the scope of dependencies and generate SBOM; 3. Use frameworks such as SpringSecurity to implement authentication and authorization, support MFA, OAuth2.0/SSO, follow the principle of minimum permissions and record audit logs; 4. Avoid hard-coded sensitive information, use Vault or K8sSecrets to manage keys, disable debugging information in the production environment, close non-essential ports, and enable HTTPS and secure TLS configuration; 5

Aug 04, 2025 am 12:55 AM
Enterprise applications java security
How do I use the 'Find and Replace' feature in Sublime Text?

How do I use the 'Find and Replace' feature in Sublime Text?

The "Find and Replace" function of SublimeText can efficiently edit the code through the following steps: 1. Find replacement in a single file: Press Ctrl H (Windows/Linux) or Cmd Option F (macOS), enter the search and replacement content, click "Find Next" to preview the match, and then select "Replace" or "Replace All". 2. Find replacements across multiple files: Press Ctrl Shift F (Windows/Linux) or Cmd Shift F (macOS) to open "Find in Files", set the search, replace content and search range, and click "Replace" to apply changes. 3. Use regular expressions to improve flexibility: click the ".*" button

Aug 03, 2025 pm 02:25 PM
Find replacement
How do you find all occurrences of a substring in a string in JavaScript?

How do you find all occurrences of a substring in a string in JavaScript?

To find all occurrences of substrings in a string, use the matchAll() method that loops with indexOf() or regular expressions. 1. Use indexOf() loop: By repeatedly calling indexOf(substr,index 1) in the while loop, continue to search from the previous matching position until there are no more matches, suitable for simple, literal substring search. 2. Use matchAll() and regular expressions: convert the substring into a regular expression and add a global flag (g), which can achieve pattern matching or ignore case searches, but special characters need to be escaped first to ensure literal matching. Both methods return an array containing all the starting indexes, where indexO

Aug 03, 2025 pm 01:55 PM
String search
Crafting a Robust Log File Parser with PHP's `preg_match_all`

Crafting a Robust Log File Parser with PHP's `preg_match_all`

Use the preg_match_all function to cooperate with regular expressions to efficiently parse PHP log files. 1. First analyze the log format such as Apache's CLF; 2. build a regular pattern with named capture groups to extract IP, methods, paths and other fields; 3. Use preg_match_all to cooperate with the PREG_SET_ORDER flag to parse multi-line logs in batches; 4. Handle edge cases such as missing fields or cross-row logs; 5. Verify and type convert the extracted data, and finally convert the unstructured logs into structured array data for further processing.

Aug 03, 2025 am 09:20 AM
PHP Regular Expressions
Understanding MySQL Enterprise Firewall

Understanding MySQL Enterprise Firewall

MySQLEnterpriseFirewall is an application-layer whitelisting mechanism used in MySQL Enterprise Edition to enhance database security. It supports three modes and is managed through the SQL interface. 1. It filters SQL queries through predefined rules to prevent attacks such as SQL injection, and is only available for enterprise version. 2. Configuration includes enabling plug-ins, creating rule groups, and loading rules. Pay attention to regular syntax and rule conflicts. 3. Common application scenarios include preventing SQL injection, controlling third-party access and audit monitoring. It is recommended to use it in combination with other security measures. 4. When using it, you need to pay attention to performance impact, ORM tool compatibility and rule update frequency, and master the skills of viewing rules and log control. Rational configuration can improve safety, but it needs to be flexibly used to adapt

Aug 03, 2025 am 07:56 AM
What is the difference between a RewriteCond and a RewriteRule?

What is the difference between a RewriteCond and a RewriteRule?

RewriteCond defines the conditions triggered by the rule, and RewriteRule defines the actions of URL rewriting. 1. RewriteCond is used to set prerequisites, such as determining whether to execute subsequent RewriteRule based on variables such as user agent, host name or IP address; 2. RewriteRule is used to define the actual URL matching and rewriting logic, and uses regular expressions to match the request path and replace it; 3. The two are often used together to ensure that redirection or rewriting only occurs when specific conditions are met, such as forcing HTTPS or www redirection; 4. Pay attention to the order, flag bits (such as [L], [NC]) and test verification to avoid loops or invalid links caused by configuration errors.

Aug 03, 2025 am 06:18 AM
SQL for Data Governance and Compliance

SQL for Data Governance and Compliance

SQL plays a key role in data governance and compliance, mainly reflected in three aspects: 1) Data classification: identify sensitive information through regular expressions and establish view isolation; 2) Permission control: use roles and row-level security policies to limit access scope; 3) Audit tracking: use triggers to record key operation logs. In addition, attention should be paid to problems such as moderate desensitization, temporary table risks, historical data cleaning and permission leakage.

Aug 03, 2025 am 04:45 AM
C std::regex_search example

C std::regex_search example

std::regex_search can be used to find whether a regular expression matches in a string. 1. It returns a boolean value to indicate whether a match is found; 2. It can combine std::smatch to get the matching content and location; 3. Use std::sregex_iterator to traverse all matches; 4. It is often used for pattern matching and text extraction such as mailboxes and phones; 5. It is necessary to pay attention to the differences in regular support of different compilers. The complete example shows the process of finding and outputting all email addresses, and the result shows two matches correctly.

Aug 03, 2025 am 03:41 AM
regular expression c++
What does the server_name directive do?

What does the server_name directive do?

The server_name directive in Nginx is used to select the virtual host to process the request based on the Host header sent by the client. Specifically: 1. Server_name matches the Host header through exact matches, wildcards or regular expressions to decide which server block to use; 2. When it does not match, it will fall back to the default server block, usually the first or explicitly marked as default_server; 3. Correct configuration of server_name helps avoid content duplication, improve SEO and enhance performance; 4. Complex matches and wildcards should be used with caution to maintain clarity and efficiency. Therefore, setting server_name reasonably can ensure that traffic is correctly routed and simplify server dimensions

Aug 02, 2025 pm 04:49 PM
python re.sub example

python re.sub example

re.sub is a function used for regular substitution in Python. Its basic syntax is re.sub(pattern, repl, string, count=0, flags=0); 1.pattern is a regular expression pattern; 2.repl is a replacement content or function; 3.string is the original string; 4.count specifies the number of replacements, default 0 means all replacements; 5.flags is a matching flag such as re.IGNORECASE; numbers can be replaced by patterns such as \d, and local substitution can be achieved with grouping() and \1 references. When repl is a function, the matching content can be processed dynamically, combined with flags, ignoring upper and lower case, or limiting the number of replacements through count, widely

Aug 02, 2025 am 11:03 AM
How to use regular expressions for pattern matching in Java?

How to use regular expressions for pattern matching in Java?

Use regular expressions to realize the search, matching and operation of strings in Java. The core steps are: 1. Import java.util.regex.Pattern and Matcher classes; 2. Use Pattern.compile() to compile regular expressions, pay attention to double backslashes to escape special characters; 3. Call pattern.matcher(input) to create Matcher object; 4. Use find() to find all matches and use group() to get the results, or use matches() to determine whether the match is exactly, and lookingAt() to determine the prefix match; 5. Common patterns include \d (number), \w (word characters), \s (empty)

Aug 02, 2025 am 10:36 AM
java regular expression
How do you check if a string contains a substring in JavaScript?

How do you check if a string contains a substring in JavaScript?

Use include() method to directly judge whether a string contains a substring, return true or false, which is recommended for simple checking; 2. The indexOf() method returns the index value or -1, and needs to be used in conjunction with the use of not equal to -1; 3. The search() method supports regular expressions, suitable for scenarios that require regular matching, but only returns the first matching position; 4. The test() method is suitable for complex pattern matching, with high flexibility but too complex for simple requirements; in summary, for ordinary substring searches, include() is the clearest and efficient choice, and regular related methods are suitable for situations where pattern matching is required. In the end, it is recommended to use include() method to complete basic inclusion checks first.

Aug 02, 2025 am 02:09 AM
string
How to use the match() method with regular expressions in JS?

How to use the match() method with regular expressions in JS?

The match() method of strings in JavaScript is very powerful to extract information through regular expressions. When using it, you need to pass a regular expression as a parameter. For example, str.match(/ain/g) will return all result arrays that match "ain"; if the g flag is not set, the first match and additional information will be returned. Common precautions include: 1. Test regular expressions to ensure correctness; 2. Use slashes to wrap the regular and pay attention to special character escapes; 3. Handle null when there is no match; 4. Capture groups can extract specific parts through brackets, such as email.match(/(\w )@(\w .\w )/) to obtain username and domain name respectively; 5.

Aug 01, 2025 am 06:15 AM

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