Regex

paket "regex";

The regex package provides support for regular expressions.

The package includes:

1. Regex constructor

A Regex object contains the following properties:

1. sablon
2. pronadji
3. pronadjiSve
4. zamijeni
5. potpunoPoklapanje

A Match object contains the following properties

1. vrijednost
2. lokacija
   • pocetak
   • kraj

Regex constructor

The Regex constructor returns a Regex object.

• takes:
  • pattern - a regex pattern (tekst)
• returns: Regex object (objekat)
• special cases:
  • Throws exception if pattern is not a valid regex pattern

var regex = Regex("\\d+");

var regex = Regex("Definitely not valid regex");

Error: 'Definitely not valid regex' is not a valid regex pattern.

sablon

The sablon property is a tekst value containing the regex pattern of the Regex object.

var regex = Regex("\\d+");
ispis(regex.sablon);

\d+

pronadji

The pronadji function returns the first match of a regular expression in the provided input tekst.

• takes: input - string to perform lookup on (tekst)
• returns: Match object (objekat)
• special cases
  • returns nedefinisano if no match is found

var regex = Regex("\\d+");
var text = "lorem 19 ip5um dol0r s1t am3t";

var match = regex.pronadji(text);
ispis(match.vrijednost);

Output:

19

A case where no match is found:

var regex = Regex("[\\[\\]{}()]");
var text = "lorem 19 ip5um dol0r s1t am3t";

var match = regex.pronadji(text);
ispis(match.vrijednost);

Output:

nedefinisano

pronadjiSve

The pronadjiSve function returns all matches of a regular expression in the provided input tekst.

• takes: input - string to perform lookup on (tekst)
• returns: Array of Match objects (niz<objekat>)
• special cases
  • returns empty niz if no matches are found

var regex = Regex("\\d+");
var text = "lorem 19 ip5um dol0r s1t am3t";

var matches = regex.pronadjiSve(text);

matches.zaSvaki(funkcija(m) => ispis(m.vrijednost));

Output:

19
5
0
1
3

zamijeni

The zamijeni function Replaces all occurrences of this regular expression in the specified input string with specified replacement expression.

• takes: input - string to perform replacements on (tekst), replacement - the expression to replace found matches with (tekst)
• returns: new tekst with the replacements
• special cases
  • returns input intact if no matches are found

var regex = Regex("\\d+");
var text = "lorem 19 ip5um dol0r s1t am3t";

var matches = regex.pronadjiSve(text);

var t = regex.zamijeni(text, "DIGITS");
ispis(t);

Output:

lorem DIGITS ipDIGITSum dolDIGITSr sDIGITSt amDIGITSt

potpunoPoklapanje

The potpunoPoklapanje function

• takes: input - string to perform lookup on (tekst)
• returns:
  • A Match object if input matches pattern in its entirety (objekat)
  • nedefinisano otherwise
• special cases: none

var regex = Regex("\\d+");
var text = "2023";

var match = regex.potpunoPoklapanje(text);
ispis(match.vrijednost);

Output:

2023

var regex = Regex("[\\[\\]{}()]");
var text = "2023";

var match = regex.potpunoPoklapanje(text);
ispis(match.vrijednost);

Output:

nedefinisano

The Match object

The Match object has the following properties:

• vrijednost - the matched string (tekst)
• lokacija (objekat)
  • pocetak index where match starts (broj)
  • kraj index where match ends (broj)

var regex = Regex("\\d+");
var text = "lorem 19 ip5um dol0r s1t am3t";

var match = regex.pronadji(text);
ispis(match);

Output

{
    vrijednost: "19",
    lokacija: {
        pocetak: 6 
        kraj: 7
    }       
}