ebfere.blogg.se - Regular expression tab rapid php

except you define exactly what characters can be matched. You can think of it as like using the dot. Sets allow you to match against a set of characters that you enclose between brackets. m: This makes the searching multiline instead of a single line.o: This evaluates the expression only once.g: This makes the searching global which prevents it from stopping after the first match.

i: This makes the searching case-insensitive.

The preg_match_all() function will return the number of matches from the search and return all the individual matches as an array. Here's the basic syntax for preg_match_all(): preg_match_all($pattern, $text, $array) We also used a new function called preg_match_all() which is the same as the earlier preg_match() function except it will return all matches. We found the word apple in our string four times, including the first match which was the uppercase Apple because we added i at the end of the pattern, which instructed PHP to ignore cases. Here's how to do a case-insensitive global search for a string inside another string: 4 matches were found.Īrray ( => Array ( => Apple => apple => apple => apple ) ) A modifier is just a character put at the end of the pattern that tells PHP to alter it's behavior.

\B: A match not at the beginning/end of a wordĪ pattern modifier allows you to change the way a pattern match works.

\b: A match at the beginning/end of a word.

?: Makes the previous character optional.

Here's a list of all the meta characters you can use in your PHP regular expressions. Notice how even though our pattern read t.aste that it was still able to match the string taste? The. character will match any single character: 1 Meta characters are characters that can be used in our regular expressions that have special meaning to them.įor example, a dot. Our search patterns can utilize meta characters. Regular expressions aren't limited to just straight text.