The character character as it is, without interpreting its special meaning within a regex expression.Īny character can be escaped except those which form any of the special character sequences above. See groups below for more info.Ī decimal digit character (same as ]).Īny character that is not a decimal digit character (same as ]).Ī whitespace character (same as ]).Īny character that is not a whitespace character (same as ]).Īn alphanumeric or underscore character (same as ]).Īny character that is not an alphanumeric or underscore character (same as ]). The result of the submatch whose opening parenthesis is the int-th ( int shall begin by a digit other than 0).
Regex match any character code#
Each of these special pattern characters is matched in the target sequence against a single character (unless a quantifier specifies otherwise).Īny character except line terminators (LF, CR, LS, PS).Ī horizontal tab character (same as \u0009).Ī newline (line feed) character (same as \u000A).Ī vertical tab character (same as \u000B).Ī carriage return character (same as \u000D).Ī control code character whose code unit value is the same as the remainder of dividing the code unit value of letter by 32.įor example: \ca is the same as \u0001, \cb the same as \u0002, and so on.Ī character whose code unit value has an hex value equivalent to the two hex digits hh.įor example: \x4c is the same as L, or \x23 the same as #.Ī character whose code unit value has an hex value equivalent to the four hex digits hhhh. Special pattern characters are characters (or sequences of characters) that have a special meaning when they appear in a regular expression pattern, either to represent a character that is difficult to express in a string, or to represent a category of characters. But the regex syntax allows for special characters and expressions in the pattern: Regular expression operations look sequentially for matches between the characters of the pattern and the characters in the target sequence: In principle, each character in the pattern is matched against the corresponding character in the target sequence, one by one.
The following syntax is used to construct regex objects (or assign) that have selected ECMAScript as its grammar.Ī regular expression pattern is formed by a sequence of characters.
ECMAScript regular expressions pattern syntax
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