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REGEXP – Regular expresion parser

Block SymbolLicensing group: ADVANCED
PIC

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

text

String to parse

String

RUN

Enable execution

Bool

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

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