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Does anyone know what the preg in preg_match, preg_grep, etc. stand for?
I know they use PCRE, which are 'Perl Compatible Regular Expressions.'
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preg_match() in PHP – this function is used to perform pattern matching in PHP on a string. It returns true if a match is found and false if a match is not found. preg_replace() in PHP – this function is used to perform a pattern match on a string and then replace the match with the specified text.
The preg_match() function searches string for pattern, returning true if pattern exists, and false otherwise. If the optional input parameter pattern_array is provided, then pattern_array will contain various sections of the subpatterns contained in the search pattern, if applicable.
In PHP, regular expressions are strings composed of delimiters, a pattern and optional modifiers. $exp = "/w3schools/i"; In the example above, / is the delimiter, w3schools is the pattern that is being searched for, and i is a modifier that makes the search case-insensitive.
Position Anchors There are certain situations where you want to match at the beginning or end of a line, word, or string. To do this you can use anchors. Two common anchors are caret ( ^ ) which represent the start of the string, and the dollar ( $ ) sign which represent the end of the string.
Perl REGular expression
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