In PHP, regular expressions are strings composed of delimiters, a pattern and optional modifiers. $exp="/w3schools/i"; In the example above,/is thedelimiter,w3schoolsis thepatternthat is being searched for, andiis amodifierthat makes the search case-insensitive. ...
In this example, The word "w3schools" is being searched for in a sentence. First, the pattern is created using thePattern.compile()method. The first parameter indicates which pattern is being searched for and the second parameter has a flag to indicates that the search should be case-insensi...
sometimes these users fill in a field with a specific phase which will lead to big problems such as SQL Injection, to read about SQL Injectionhttps://www.w3schools.com/sql/sql_injection.asp.
Regular expressions allow you to search for and replace patterns in strings.InstallationThe PHP regular expression functions are part of the PHP core. No installation is required to use these functions.Runtime ConfigurationThese settings in php.ini can be used to limit the amount time or resources...