(PHP) Regular expression - ignore case

Golang regular expressions use the pipe character | to match multiple words or strings, separating each option as a logical OR expression. For example: matches "fox" or "dog": fox|dog matches "quick", "brown" or "lazy": (quick|brown|lazy) matches "Go", "Python" or "Java": Go|Python |Java matches words or 4-digit zip codes: ([a-zA

PHP regular expressions are a powerful tool for text processing and conversion. It can effectively manage text information by parsing text content and replacing or intercepting it according to specific patterns. Among them, a common application of regular expressions is to replace strings starting with specific characters. We will explain this as follows

How to remove Chinese in PHP using regular expressions: 1. Create a PHP sample file; 2. Define a string containing Chinese and English; 3. Use "preg_replace('/([\x80-\xff]*)/i', '',$a);" The regular method can remove Chinese characters from the query results.

In this article, we will learn how to remove HTML tags and extract plain text content from HTML strings using PHP regular expressions. To demonstrate how to remove HTML tags, let's first define a string containing HTML tags.

In Python, we can use comparison operators such as "==", "!=", "", "=" and Python built-in functions such as lower() and upper() methods to compare two characters by ignoring case string. A string is a sequence of characters enclosed in double quotes. These operators compare strings based on the Unicode code points assigned to each character of the string. In this article, we will learn how to compare two strings by ignoring the case of the strings. Comparing Strings Ignoring Case To compare two strings in Python and ignoring case, we can use the lower() or upper() function to convert the strings to lowercase or uppercase respectively. Once the string is completely converted to small

Website security has attracted more and more attention, and using the HTTPS protocol to ensure the security of data transmission has become an important part of current website development. In PHP development, how to use regular expressions to verify whether the URL is HTTPS protocol? here we come to find out. Regular expression Regular expression is an expression used to describe rules. It is a powerful tool for processing text and is widely used in text matching, search and replacement. In PHP development, we can use regular expressions to match http in the URL

Sharing tips on using PHP regular expressions to implement the Chinese replacement function. In web development, we often encounter situations where Chinese content needs to be replaced. As a popular server-side scripting language, PHP provides powerful regular expression functions, which can easily realize Chinese replacement. This article will share some techniques for using regular expressions to implement Chinese substitution in PHP, and provide specific code examples. 1. Use the preg_replace function to implement Chinese replacement. The preg_replace function in PHP can be used

PHP regular replacement examples: quickly master replacement skills. With the development of the Internet, website development has become more and more common. In website development, it is often necessary to replace strings, and regular expressions are a very powerful tool that can quickly search and replace strings. This article will introduce how to use regular expressions in the PHP language to perform replacement operations, and provide specific code examples to help readers quickly master replacement techniques. 1.preg_replace function in PHP, you can use preg