How do you match non-alphanumeric expressions?
If we want regex matches non-alphanumeric characters, prefix it with a negate symbol ^ , meaning we want any characters that are not alphanumeric.
Which function is used to replacing pattern in string?
The REGEXREPLACE( ) function uses a regular expression to find matching patterns in data, and replaces any matching values with a new string.
What is Preg_replace PHP?
The preg_replace() function is an inbuilt function in PHP which is used to perform a regular expression for search and replace the content. Syntax: preg_replace( $pattern, $replacement, $subject, $limit, $count )
What is non-alphanumeric characters?
Non-alphanumeric characters are those characters or kinds of symbols that appear on the keyboard of a computer, including punctuation and mathematical symbols, these special characters are called non-alphanumeric characters. Those characters, which are not letters or numbers, are non-alphanumeric characters.
Which function is used to replacing pattern in string in PHP?
preg_replace() function
The preg_replace() function returns a string or array of strings where all matches of a pattern or list of patterns found in the input are replaced with substrings.
What is the difference between Str_replace and Preg_replace?
str_replace replaces a specific occurrence of a string, for instance “foo” will only match and replace that: “foo”. preg_replace will do regular expression matching, for instance “/f. {2}/” will match and replace “foo”, but also “fey”, “fir”, “fox”, “f12”, etc.
What is preg replace?
The preg_replace() function returns a string or array of strings where all matches of a pattern or list of patterns found in the input are replaced with substrings. Matches of the pattern are replaced with the replacement string. 2. An array of patterns and a replacement string.
How do you lowercase in PHP?
PHP | strtolower() Function The strtolower() function is used to convert a string into lowercase. This function takes a string as parameter and converts all the uppercase english alphabets present in the string to lowercase. All other numeric characters or special characters in the string remains unchanged.