|
Qore Programming Language Reference Manual
0.8.8
|
Regular expression functionality in Qore is provided by PCRE: Perl-Compatible Regular Expression library.
Using this library, Qore implements regular expression pattern matching using the same syntax and semantics as Perl 5.
The following is a list of operators based on regular expressions (or similar to regular expressions in the case of the transliteration operator).
Regular Expression Operators
| Operator | Description |
| Regular Expression Match Operator (=~) | Returns True if the regular expression matches a string |
| Regular Expression No Match Operator (!~) | Returns True if the regular expression does not match a string |
| Regular Expression Substitution Operator | Substitutes text in a string based on matching a regular expression |
| Regular Expression Pattern Extraction Operator | Returns a list of substrings in a string based on matching patterns defined by a regular expression |
| Transliteration Operator | Not a regular expression operator; transliterates one or more characters to other characters in a string |
See the table below for valid regular expression options.
| Option | Description |
i | Ignores case when matching |
m | makes start-of-line (^) or end-of-line ($) match after or before any newline in the subject string |
s | makes a dot (.) match a newline character |
x | ignores whitespace characters and enables comments prefixed by # |
g | makes global substitutions or global extractions (only applicable with the substitution and extraction operators) |
The following is a list of functions providing regular expression functionality where the pattern may be given at run-time:
Regular Expression Functions
| Function | Description |
| regex() | Returns True if the regular expression matches a string |
| regex_subst() | Substitutes a pattern in a string based on regular expressions and returns the new string |
| regex_extract() | Returns a list of substrings in a string based on matching patterns defined by a regular expression |