Filter_var regexp

Voila en exemple une regex mal optimisé qui fonctionne sur un champ titre pour des nouvelles. Filtre une variable avec un filtre spécifique refsect1-function. Just about the biggest time-sink on any project, is the amount of input validation that needs to be done. The actual filtering of variables is done with the filter_var() function. This article contains PHP code with regular expression to validate different numbers and strings.

Because of the limitations of filter_var(), you may have to fall back to using a regular expression. Becomes sometimes usingresults in much shorter and more accurate code. Tries to find a golden Regular Expression that will match every possible combination.

This regular expression is better than the filter_var function but it is not optimum yet. David Celis argues that we should stop validating addresses with regular expressions, saying, that it’s waste of time and effort. For a complete understanding on regular expressions and unicode I advise you to read the whole tutorial.

Regular expressions (abbreviated regex) are sequences of characters that form search patterns. Regular expressions are quite powerful and can be used to test a lot of different patterns. I tested the regular expression and the filter_var functions by running each 100,000 times.

Any characters in the input string that don’t match the regular expression are replaced with the replacement string.