ALL meanings of re
re
R r - abbreviation Technical meaning of RE regular expression 3
- noun Definition of re in Technology 1. (text, operating system) (regexp, RE) One of the wild card patterns used by Perl and other languages, following Unix utilities such as grep, sed, and awk and editors such as vi and Emacs. Regular expressions use conventions similar to but more elaborate than those described under glob. A regular expression is a sequence of characters with the following meanings (in Perl, other flavours vary): An ordinary character (not one of the special characters discussed below) matches that character. A backslash (\) followed by any special character matches the special character itself. The special characters are: "." matches any character except newline; "RE*" (where RE is any regular expression and the "*" is called the "Kleene star") matches zero or more occurrences of RE. If there is any choice, the longest leftmost matching string is chosen. "^" at the beginning of an RE matches the start of a line and "$" at the end of an RE matches the end of a line. (RE) matches whatever RE matches and \N, where N is a digit, matches whatever was matched by the RE between the Nth "(" and its corresponding ")" earlier in the same RE. Many flavours use \(RE\) instead of just (RE). The concatenation of REs is a RE that matches the concatenation of the strings matched by each RE. RE1 | RE2 matches whatever RE1 or RE2 matches. \< matches the beginning of a word and \> matches the end of a word. Many flavours use "\b" instead as the special character for "word boundary". RE{M} matches M occurences of RE. RE{M,} matches M or more occurences of RE. RE{M,N} matches between M and N occurences. Other flavours use RE\{M\} etc. Perl provides several "quote-like" operators for writing REs, including the common // form and less common ??. A comprehensive survey of regexp flavours is found in Friedl 1997 (see below). 2. Any description of a pattern composed from combinations of symbols and the three operators: Concatenation - pattern A concatenated with B matches a match for A followed by a match for B. Or - pattern A-or-B matches either a match for A or a match for B. Closure - zero or more matches for a pattern. The earliest form of regular expressions (and the term itself) were invented by mathematician Stephen Cole Kleene in the mid-1950s, as a notation to easily manipulate "regular sets", formal descriptions of the behaviour of finite state machines, in regular algebra. 1
- abbreviation RE Ra. 1
- preposition re in the matter of. 1
- noun Technical meaning of re 1. (networking) The country code for Reunion. 2. (chat) /re-/ (From "rehi") Hello again. A greeting originating in, and most often heard on, Internet interactive conversation services. 1
- noun re You use re in business letters, faxes, or other documents to introduce a subject or item which you are going to discuss or refer to in detail. 0
- uncountable noun re R.E. is a school subject in which children learn about religion and other social matters. R.E. is an abbreviation for 'religious education'. 0
- preposition re with reference to 0
- domain name re Reunion Island 0
- abbreviation RE rhenium 0
- abbreviation RE rupee 0
- abbreviation RE Reformed Episcopal 0
- abbreviation RE Religious Education 0
- abbreviation RE Right Excellent 0
- abbreviation RE Royal Engineers 0
- contraction re are 0
- preposition re in the matter of; as regards 0
- noun re a syllable representing the second tone of the diatonic scale 0