unix regular expression examples

Simplest regular example:/d{4}-/d{2}-/d{2}But the reality is not so simple, to consider, effectiveness and leap year and other issues ... For a valid range of dates, different scenarios vary. The valid ranges for DateTime objects defined in MSDN are: 0001-01-01 00:00:00 to 9999-12-31 23:59:59. The Unix timestamp is 0 in accordance with the ISO 8601 specification: 1970-01-01t00:00:00z. Consider first thre

often necessary to distinguish whether the request is HTTPS or HTTP. The following expression can be used to retrieve the prefix of a url and then perform logic judgment. if (!s.match(/^[a-zA-Z]+:\/\//)) { s = 'http://' + s;} 14. Extract URL links The following expression filters out the URLs in a piece of text. var reg = /^(f|ht){1}(tp|tps):\/\/([\w-]+\.)+[\w-]+(\/[\w- ./?%=]*)?/; 15. File Path and exten

') ('XbcdXf', 2) 7. Extended symbols By using (? ILmsux) series options. You can specify one or more tags in a regular expression instead of using compile () or other re-module functions. The following are some examples of using re. I/IGNORECASE. The last example implements multi-row mixing in re. M/MULTILINE: >>> Re. findall (R '(? I) yes ', 'Yes? Yes. YES !! '

1. Basic Grammar of regular expressions Two special symbols ' ^ ' and ' $ '. Their role is to point out the beginning and end of a string, respectively. Examples are as follows: "^the": denotes all strings starting with "the" ("There", "the Cat", etc.); "Of despair$": a string representing the end of "of despair"; "^abc$": means that the beginning and end are "abc" string-hehe, only "ABC" itself; "Not

Regular expressions for common SQL attacks in php are summarized and SQL regular expressions are used. Regular expressions of common SQL attacks in php are summarized. This article describes the regular expressions of common SQL attacks in php. Share it with you for your reference. The specific analysis is as follows:

engine, which is the most widely used engine. We will also mention some differences from other engines. Many modern engines are similar, but not exactly the same. For example. NET regular library, JDK regular package.3. Text symbolsThe most basic regular expression consists of a single literal symbol. such as · Specia

For example, I am honored to announce that the author of this bad regular expression is me. The regular expression originating from Unix has always been the Swiss army knife for string processing. Today, I wrote a program with this knife, and the result is not consistent wi

Java regular expression, Regular ExpressionJava Regular Expression Regular Expression 1. Two classes are provided in the java. util. regex package to support

PHP regular expression filters html tag attributes (DEMO) and regular expression demo. PHP regular expression filters html tag attributes (DEMO). Regular

VBScritp5.0, as long as your server has ie5.x installed, it will bring VBScript5.0. In fact, the "regular expression" is originally a patent under Unix, especially in the Perl language is the most widely used, it is because of "regular expression" powerful features, so that

A regular expression is a text pattern that includes ordinary characters (for example, letters between A and z) and special characters (called "metacharacters"). The pattern describes one or more strings to match when searching for text. 1. Basic Grammar of regular expressions Two special symbols ' ^ ' and ' $ '. Their role is to point out the beginning and end

The regular expression is not a programming language, and there is no function of computing and dealing with problems, it is a single string that describes or matches a series of strings that conform to a certain syntactic rule.Examples of regular expression applications: Prevent SQL injection: Especially for

often used to remove a character. In the preceding example, the first character must not be a number: ^[^0-9][0-9]$ This pattern matches " 5", "g7", and "-2", but does not match "12", "66. The following are examples of how to exclude specific characters: [^ A-z] // All characters except lower-case letters [^ \/\ ^] // except (\) (/) (^) all characters other than [^ \ "\ '] // All characters except double quotation marks (") and single quotation marks