How can i create a regular expression which can detect a new line charcter followed by a special character say * and replace these both by a string of zero length?
Eg:
Input File san.txt
hello
hi ... (6 Replies)
how to find for a file whose name has all characters in uppercase after 'project'?
I tried this:
find . -name 'project**.pdf'
./projectABC.pdf
./projectABC123.pdf
I want only ./projectABC.pdf
What is the regular expression that correponds to "all characters are capital"?
thanks (8 Replies)
I have a flat file with the following drug names
Nutropin AQ 20mg PEN Cart 2ml
Norditropin Cart 15mg/1.5ml
I have to extract digits that are before mg i.e 20 and 15 ; how to do this using regular expressions
Thanks
ram (1 Reply)
In regular expressions with grep(or egrep), ^ works if we want something in starting of line..but what if we write ^^^ or ^ for pattern matching??..Hope u all r familiar with regular expressions for pattern matching.. (1 Reply)
what elements does " /^/ " match?
I did the test which indicates that it matches single lowercase character like 'a','b' etc. and '1','2' etc.
But I really confused with that. Because, "/^abc/" matches strings like "abcedf" or "abcddddee".
So, what does caret ^ really mean?
Any response... (2 Replies)
I have a file that I'm trying to find all the cases of phone number extensions and deleting them. So input file looks like:
abc
x93825
def
13234
x52673
hello
output looks like:
abc
def
13234
hello
Basically delete lines that have 5 numbers following "x". I tried: x\(4) but it... (7 Replies)
I am new to shell scripts.Can u please help me on this req.
test_user = "Arun"
if
echo "test_user is a word"
else
echo "test_user is not a word" (1 Reply)
Perl::Critic::Policy::RegularExpressions::RequireExtendeUsermContributed PerPerl::Critic::Policy::RegularExpressions::RequireExtendedFormatting(3)NAME
Perl::Critic::Policy::RegularExpressions::RequireExtendedFormatting - Always use the "/x" modifier with regular expressions.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
Extended regular expression formatting allows you mix whitespace and comments into the pattern, thus making them much more readable.
# Match a single-quoted string efficiently...
m{'[^\']*(?:\.[^\']*)*'}; #Huh?
# Same thing with extended format...
m{
' # an opening single quote
[^\'] # any non-special chars (i.e. not backslash or single quote)
(?: # then all of...
\ . # any explicitly backslashed char
[^\']* # followed by an non-special chars
)* # ...repeated zero or more times
' # a closing single quote
}x;
CONFIGURATION
You might find that putting a "/x" on short regular expressions to be excessive. An exception can be made for them by setting
"minimum_regex_length_to_complain_about" to the minimum match length you'll allow without a "/x". The length only counts the regular
expression, not the braces or operators.
[RegularExpressions::RequireExtendedFormatting]
minimum_regex_length_to_complain_about = 5
$num =~ m<(d+)>; # ok, only 5 characters
$num =~ m<d.(d+)>; # not ok, 9 characters
This option defaults to 0.
Because using "/x" on a regex which has whitespace in it can make it harder to read (you have to escape all that innocent whitespace), by
default, you can have a regular expression that only contains whitespace and word characters without the modifier. If you want to restrict
this, turn on the "strict" option.
[RegularExpressions::RequireExtendedFormatting]
strict = 1
$string =~ m/Basset hounds got long ears/; # no longer ok
This option defaults to false.
NOTES
For common regular expressions like e-mail addresses, phone numbers, dates, etc., have a look at the Regexp::Common module. Also, be
cautions about slapping modifier flags onto existing regular expressions, as they can drastically alter their meaning. See
<http://www.perlmonks.org/?node_id=484238> for an interesting discussion on the effects of blindly modifying regular expression flags.
TO DO
Add an exemption for regular expressions that contain "Q" at the front and don't use "E" until the very end, if at all.
AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>
COPYRIGHT
Copyright (c) 2005-2011 Imaginative Software Systems. All rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license
can be found in the LICENSE file included with this module.
perl v5.16.32014-06-Perl::Critic::Policy::RegularExpressions::RequireExtendedFormatting(3)