They'll all read a JSON file/string nicely, and return a Perl data structure. There is a core library JSON::PP, then there are the better JSON::XS and Cpanel::JSON::XS. However this special character (\s) will match any of the previous whitespaces.There are good libraries in Perl for work with JSON data, shown in the question. WHITESPACE - Generally the types of whitespace found with regular expressions are the space (\ ), the new line (\n), the tab (\t) and the carriage return (\r). * Non-captured groups are often uset to mark the boundaries or intermediary states of a regular expression in order to match the inner content of a subgroup or to ignore punctuation and any other unwanted text. NON-CAPTURED - groups need to be present within the searchable text in order to have a positive match for the regular expression however they will not be recorded nor present within the returned match. * The best aproach is to handle the balanced groups inside the callback function while deleting the outer layers of all captured groups and record their position/existence. Balanced groups are not integrated in the same manner by all programming languages and more importantly at least in the case of nesting groups the expression will have to rescan within inner layers of all the matched, captured groups slowing the entire execution. WILDCARD - ammounts for an unknown quantity of searchable text for which we can set a list of allowed characters, restrict certain characters or sequences/words and set a minimum and/or a maximum length.ĬAPTURED - groups represent parts of the searchable text that matched entirely or differents parts of the regular expression being ENCLOSED in ROUND BRACKETS (group).īACKREFERENCE - holds a reference to a captured group, a handle to that value and can be used later within the expression to balance groups or stipulate unicity or in the replace string and ultimately in the callback function.īALANCED - groups will match the N(number of occurrences) for group A and B within the searchable text and are generally used to match open and close brackets like "(" and ")" or to match html containers nesting or not.
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