Core Function Scanf
(→Example) |
(→Remarks) |
||
| Line 29: | Line 29: | ||
=== Remarks === | === Remarks === | ||
| − | + | If only two parameters were passed to this function, the values parsed will be returned as an array. Otherwise, if optional parameters are passed, the function will return the number of assigned values. | |
If there are more substrings expected in the format than there are available within str, they will be ignored and you will get what did match. | If there are more substrings expected in the format than there are available within str, they will be ignored and you will get what did match. | ||
Revision as of 16:51, 22 January 2013
Scanf( <expression>, <def> )
Contents |
Description
Parses input from a string according to a format.
Parameters
expression
The string to evaluate.
def
The formation string containing the definition of how to parse the string.
extra ...
Optionally pass in variables by reference that will contain the parsed values.
Return Value
Success: Returns array of all captured objects from the parsed string.
Failure: Returns empty array.
Remarks
If only two parameters were passed to this function, the values parsed will be returned as an array. Otherwise, if optional parameters are passed, the function will return the number of assigned values.
If there are more substrings expected in the format than there are available within str, they will be ignored and you will get what did match.
Example
my $RET = Scanf("X123 Y456", "X%d Y%d"); printr($RET); my $RET = Scanf("Copyright 2009-2011 CompanyName (Multi-Word Message)", "Copyright %d-%d %s (%[^)]"); printr($RET);
Example #1 sscanf() Example
// getting the serial number list($serial) = Scanf("SN/2350001", "SN/%d"); // and the date of manufacturing $mandate = "January 01 2000"; list($month, $day, $year) = Scanf($mandate, "%s %d %d"); println("Item $serial was manufactured on: $year-" . substr($month, 0, 3) . "-$day");
Example #2 sscanf() - using optional parameters If optional parameters are passed, the function will return the number of assigned values.
// get author info and generate DocBook entry $auth = "24\tLewis Carroll"; $n = Scanf($auth, "%d\t%s %s", $id, $first, $last); print("<author id='$id'> <firstname>$first</firstname> <surname>$last</surname> </author>\n");
Example of how %s will stop if it finds the next thing you want to parse such as a .
// Heres an example of how the parser will stop not just on whitespace // but also on what it needs to parse next for example // 'file_%s.%s' means find file_ then STRING then . then STRING // in most Scanf stuff such as PHPs you would get NULL for second variable // but in Sputnik you will get the file extension in the second variable properly // this is because when it starts searching for the first string it will stop // if it finds a . (since . comes after the %s in the format!) $out = Scanf('file_name.gif', 'file_%s.%s', $fpart1, $fpart2); println("Name '$fpart1' Ext '$fpart2'");
