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Top Forums Shell Programming and Scripting I am learning regular expression in sed,Please help me understand the use curly bracket in sed, Post 302904540 by migurus on Wednesday 4th of June 2014 03:42:53 PM
Old 06-04-2014
A snippet from man regexp
Code:
Matching a specified number of occurrences
    A BRE interval expression has the syntax ``\{l\}'', ``\{l,\}'',
   or ``\{l,u\}''.
    An ERE interval expression has the syntax ``{l}'', ``{l,}'', or
   ``{l,u}''.

Also,
I found this site:
http://http://txt2re.com/index-python.php3
very helpful when dealing with regular expressions
 

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WEB2DISK(1)							      calibre							       WEB2DISK(1)

NAME
web2disk - part of calibre SYNOPSIS
web2disk URL DESCRIPTION
Where URL is for example http://google.com Whenever you pass arguments to web2disk that have spaces in them, enclose the arguments in quotation marks. OPTIONS
--version show program's version number and exit -h, --help show this help message and exit -d, --base-dir Base directory into which URL is saved. Default is . -t, --timeout Timeout in seconds to wait for a response from the server. Default: 10.0 s -r, --max-recursions Maximum number of levels to recurse i.e. depth of links to follow. Default 1 -n, --max-files The maximum number of files to download. This only applies to files from <a href> tags. Default is 2147483647 --delay Minimum interval in seconds between consecutive fetches. Default is 0 s --encoding The character encoding for the websites you are trying to download. The default is to try and guess the encoding. --match-regexp Only links that match this regular expression will be followed. This option can be specified multiple times, in which case as long as a link matches any one regexp, it will be followed. By default all links are followed. --filter-regexp Any link that matches this regular expression will be ignored. This option can be specified multiple times, in which case as long as any regexp matches a link, it will be ignored. By default, no links are ignored. If both filter regexp and match regexp are speci- fied, then filter regexp is applied first. --dont-download-stylesheets Do not download CSS stylesheets. --verbose Show detailed output information. Useful for debugging SEE ALSO
The User Manual is available at http://manual.calibre-ebook.com Created by Kovid Goyal <kovid@kovidgoyal.net> web2disk (calibre 0.8.51) January 2013 WEB2DISK(1)
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