Use a regular expression to do a case-insensitive search for "w3schools" in a string: $str = "Visit W3Schools"; $pattern = "/w3schools/i"; echo preg_match($pattern, $str); Try it Yourself » Using preg_match_all()The preg_match_all() function will tell you how many matches ...
PatternSyntaxExceptionClass - Indicates syntax error in a regular expression pattern ExampleGet your own Java Server Find out if there are any occurrences of the word "w3schools" in a sentence: importjava.util.regex.Matcher;importjava.util.regex.Pattern;publicclassMain{publicstaticvoidmain(String[]...
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 wi...