Use a regular expression to do a case-insensitive search for "w3schools" in a string: $str="Visit W3Schools";$pattern="/w3schools/i";echopreg_match($pattern,$str); Try it Yourself » Using preg_match_all() Thepreg_match_all()function will tell you how many matches were found for...
Pattern Class - Defines a pattern (to be used in a search) Matcher Class - Used to search for the pattern PatternSyntaxException Class - Indicates syntax error in a regular expression patternExampleGet your own Java Server Find out if there are any occurrences of the word "w3schools" in a...
In this article, I’ll try to explain what regular expression is and how you can use its class in your C# app to validate a user input. What is regular expression? A regular expression is a specific pattern used to parse and find matches in strings. A regular expression is sometimes cal...
preg_replace() Returns a string where matches of a pattern (or an array of patterns) are replaced with a substring (or an array of substrings) in a given string preg_replace_callback() Given an expression and a callback, returns a string where all matches of the expression are replaced...