In this case, a subexp call can not be performed although Not only a name but a number is assigned like a capturedĪssigning the same name as two or more subexps is allowed. (All characters of the name must be a word character.) (?imx-imx:subexp) option on/off for subexp Word Letter | Mark | Decimal_Number | Connector_Punctuation Space Space_Separator | Line_Separator | Paragraph_Separator | Punct Connector_Punctuation | Dash_Punctuation | Close_Punctuation |įinal_Punctuation | Initial_Punctuation | Other_Punctuation | Graph ] & ^Control & ^Unassigned & ^Surrogate Word alphanumeric, "_" and multibyte charactersĬntrl Control | Format | Unassigned | Private_Use | Surrogate Print include all of multibyte encoded characters Graph include all of multibyte encoded characters In a character class, you should escape these characters by '\'. * If you want to use '' as a normal character
intersection (low precedence at the next of ^)Įx. set (character class in character class) negative class (lowest precedence operator) \Z end of string, or before newline at the end The basic quantifiers are the asterisk ( *) to specify that the match should happen zero or more times, plus ( +) for one or more times, or a range can be given as + are possessive op. ) will match any character (except newline). Something like \w will match word characters, where \s will match whitespace characters (space, tab, newline, etc.). Instead we use regular expressions which describe the match as a string which (in a simple case) consists of the character types to match and quantifiers for how many times we want to have the character type matched.įor example normal letters and digits match literally.
#GREP REGEX REFERENCE PORTABLE#
Naively we could write a small program to match text, but this is error-prone, tedious and not very portable or flexible. A regular expression is a domain specific language for matching text.
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