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Homework and Emergencies Homework & Coursework Questions Regular Expressions with GREP Post 302598092 by george88 on Monday 13th of February 2012 10:38:21 AM
Old 02-13-2012
16 ) you hit null results since you have explicitly escaped the *. It makes the grep command to look for actual 'asterix' in the words.

instead of ::
grep -i '^\(\w\)\(\w\)\(\w\)\w\*/\3/\2/\1$' big_english.txt

make it::
Code:
grep -i '^\(\w\)\(\w\)\(\w\)\w*\3\2\1$' big_english.txt

This will return you the list of words having the first three letters repeated in the last three positions with in reverse order with zero or more characters in between.

Last edited by george88; 02-13-2012 at 01:47 PM..
 

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CREATE TEXT SEARCH 
TEMPLATE(7) SQL Commands CREATE TEXT SEARCH TEMPLATE(7) NAME
CREATE TEXT SEARCH TEMPLATE - define a new text search template SYNOPSIS
CREATE TEXT SEARCH TEMPLATE name ( [ INIT = init_function , ] LEXIZE = lexize_function ) DESCRIPTION
CREATE TEXT SEARCH TEMPLATE creates a new text search template. Text search templates define the functions that implement text search dic- tionaries. A template is not useful by itself, but must be instantiated as a dictionary to be used. The dictionary typically specifies parameters to be given to the template functions. If a schema name is given then the text search template is created in the specified schema. Otherwise it is created in the current schema. You must be a superuser to use CREATE TEXT SEARCH TEMPLATE. This restriction is made because an erroneous text search template definition could confuse or even crash the server. The reason for separating templates from dictionaries is that a template encapsulates the ``unsafe'' aspects of defining a dictionary. The parameters that can be set when defining a dictionary are safe for unprivileged users to set, and so creating a dictionary need not be a privileged operation. Refer to in the documentation for further information. PARAMETERS
name The name of the text search template to be created. The name can be schema-qualified. init_function The name of the init function for the template. lexize_function The name of the lexize function for the template. The function names can be schema-qualified if necessary. Argument types are not given, since the argument list for each type of function is predetermined. The lexize function is required, but the init function is optional. The arguments can appear in any order, not only the one shown above. COMPATIBILITY
There is no CREATE TEXT SEARCH TEMPLATE statement in the SQL standard. SEE ALSO
ALTER TEXT SEARCH TEMPLATE [alter_text_search_template(7)], DROP TEXT SEARCH TEMPLATE [drop_text_search_template(7)] SQL - Language Statements 2010-05-14 CREATE TEXT SEARCH TEMPLATE(7)
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