Update custom-properties.mdx

pages/docs/features/custom-properties.mdx

@@ -142,9 +142,9 @@ Use the following functions in the **Formula** field to modify your custom prope
 | upper | Cast string property values to uppercase. | upper(string property)<br /><br />Example:<br />`upper(A); upper("hello")` -> "HELLO" |
 | lower | Cast string property values to lowercase. | lower(string property)<br /><br />Example:<br />`lower(A); lower("FacEBook")` -> "facebook" |
 |parse_url()| Extracts the part of the url that is specified: domain(google) or full_domain(google.co.uk) | parse_url(string property, "domain") or parse_url(string property, "full_domain") <br /><br />Example: parse_url(A,"domain") |
-| regex_extract | If haystack is a string and pattern matches at least one substring, extracts the result from the first pattern match in haystack. The result is a string equal to the entire regex match, or if capture group is specified, only that portion of the match. | regex_extract(haystack, pattern, &lt;optional capture group#&gt;)<br /><br />Example:<br />`regex_extract("iPhone5.1","iPhone(...)",1)` ->5.1 |
-| regex_match | Returns true if the pattern matches any part of the string. | regex_match(haystack, pattern)<br /><br />Example:<br />`regex_match("zzhaystackzz", "ha(..)ack")` -> true <br /> // Use (?-i) for case-sensitive matching: `regex_match("HAYSTACK", "(?-i)haystack")` -> false |
-| regex_replace | Replaces the parts of a string that match a regular expression with a different string. | regex_replace(haystack, pattern, replacement)<br /><br />Example:<br />  // convert currency string to number: `regex_replace("$1,234,567", "[^.0-9]\*", ""))` -> `1234567` |
+| regex_extract | If haystack is a string and pattern matches at least one substring, extracts the result from the first pattern match in haystack. The result is a string equal to the entire regex match, or if capture group is specified, only that portion of the match. We use the PCRE2 regex engine. | regex_extract(haystack, pattern, &lt;optional capture group#&gt;)<br /><br />Example:<br />`regex_extract("iPhone5.1","iPhone(...)",1)` ->5.1 |
+| regex_match | Returns true if the pattern matches any part of the string. We use the PCRE2 regex engine. | regex_match(haystack, pattern)<br /><br />Example:<br />`regex_match("zzhaystackzz", "ha(..)ack")` -> true <br /> // Use (?-i) for case-sensitive matching: `regex_match("HAYSTACK", "(?-i)haystack")` -> false |
+| regex_replace | Replaces the parts of a string that match a regular expression with a different string. We use the PCRE2 regex engine. | regex_replace(haystack, pattern, replacement)<br /><br />Example:<br />  // convert currency string to number: `regex_replace("$1,234,567", "[^.0-9]\*", ""))` -> `1234567` |
 | datedif | Subtract two dates. Units:<br />D: days.<br />M:  months.<br />Y: years<br />MD:  days remaining after subtracting whole months.<br />YM:  months remaining after subtracting whole years.<br />YD:  days, assuming start_date and end_date are within 1 year.<br />Use TODAY() for current day. |<br />datedif(start_date,end_date,unit)<br /><br />Example:<br />`datedif(registration_date,TODAY(), "M")` -> 5 |
 | len | Returns the length of the string or the list. | len(string) or len(list)<br /><br />Example:<br /> `len("Canada")` -> 6 |
 | left | Returns characters from the beginning of a given string. | left(string, num_of_characters)<br /><br />Example:<br />`left("Canada",3)` -> "Can" |