Regular Expression Reference

[String_ReplaceRegExp] in LDML Reference

[String_FindRegExp] in LDML Reference

Matching Symbols

a-z A-Z 0-9 - Alphanumeric characters match the specified character.
. - Period matches any single character.
^ - Circumflex matches the beginning of a line.
$ - Dollar sign matches the end of a line.
\\... - A backslash escapes the next character. \\\\ represents a backslash.
[...] - Square brackets create a character class matching any character included inside.
[^...] - With a carat, any character other than those included inside is matched.
[a-z] - A range of characters can be specified.
\t - A tab character.
\r - A return character.
\n - A new-line character.
\" - A double quote.
\' - A single quote.
\\w - Matches any alphanumeric character or an underscore.
\\W - Matches any non-alphanumeric character.
\\s - Matches a whitespace character (space, tab, return, etc.).
\\S - Matches a non-whitespace character.
\\d - Matches a numeric digit.
\\D - Matches any non-numeric character.

Combination Symbols

| - Alternation. Matches either the character before or the character after the symbol.
( ) - Grouping. Defines a named group for output. Nine pairs of parentheses can be defined.
* - Asterisk matches 0 or more repetitions of the preceding character.
*? - Matches the shortest possible number of repetitions of the preceding character.
+ - Plus sign matches 1 or more repetitions of the preceding character.
? - Question mark matches 0 or 1 repetitions of the preceding character.
{n} - Matches n repetitions of the preceding character.
{n,} - Matches at least n repetitions of the preceding character.
{n,m} - Matches at least n, but no more than m repetitions of the preceding character.

Replacement Symbols

\\1 ... \\9 - An escaped number substitutes in the specified group (defined by parentheses) from the source.