REGEXP – Regular expresion parser

Block SymbolLicensing group: ADVANCED

Function Description
This block implements a subset of Perl or C# or Unix command grep regular expression syntax.

Supported syntax is :

(?i) …Must be at the beginning of the regex. Makes match case-insensitive
^ …Match beginning of a buffer
$ …Match end of a buffer
() …Grouping and substring capturing
\s …Match whitespace
\S …Match non-whitespace
\d …Match decimal digit
\n …Match new line character
\r …Match line feed character
\f …Match form feed character
\v …Match vertical tab character
\t …Match horizontal tab character
\b …Match backspace character
+ …Match one or more times (greedy)
+? …Match one or more times (non-greedy)
* …Match zero or more times (greedy)
*? …Match zero or more times (non-greedy)
? …Match zero or once (non-greedy)
x|y …Match x or y (alternation operator)
\meta …Match one of the meta characters: ^$().[ ]*+?|\
\xHH …Match byte with hex value 0xHH, e.g. \x4a
[...] …Match any character from set. Ranges like [a-z] are supported.
[^...]…Match any character except the ones in set. Ranges like [a-z] are supported.

Examples

[0-9]+ …Find first integer in input string (and put it into cap output)
[-+]?[0-9]*\.[0-9]+([eE][-+]?[0-9]+)?…Find first real number in input string (and put it into cap output)
^\s*(.*?)\s*$ …Put trimmed input string into cap1 output
num\s*:\s*([0-9]*\.[0-9]*) …Expect input string in JSON format; find integer parameter num, and put its value into cap1

Inputs

Parameters

expr	Regular expresion pattern	String
nmax	Allocated size of string $↓$ 0 $↑$ 65534	Long (I32)
bufmax	Parser internal buffer size (0 = autodetect) $↓$ 0 $↑$ 10000000	Long (I32)

Outputs

MATCH	Pattern match flag	Bool
cap	Whole matching string	String
cap1	Captured string (string matched to 1st bracket)	String
cap2	Captured string (string matched to 2nd bracket)	String
cap3	Captured string (string matched to 3rd bracket)	String
cap4	Captured string (string matched to 4th bracket)	String
cap5	Captured string (string matched to 5th bracket)	String
cap6	Captured string (string matched to 6th bracket)	String
cap7	Captured string (string matched to 7th bracket)	String
cap8	Captured string (string matched to 8th bracket)	String