When you need to protect special characters on the command line, you need to use quoting. However, as you've found, if the special characters are the quote symbols themselves, you can run into trouble.
One solution for some versions of grep is to have the pattern in a file so that it does not appear on the command line. That can be accomplished by using a here document to create the file. There are features in the here document syntax to ignore special characters, in addition to creating a file from within a script. Once that is done, we can use grep to read the regular expressions from the newly-created file. Here is an example:
Code:
#!/usr/bin/env bash
# @(#) s1 Demonstrate isolation of quotes in file for grep.
echo
set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version "=o" $(_eat $0 $1) grep
set -o nounset
echo
FILE=${1-data1}
echo " Data file $FILE:"
cat $FILE
echo
echo " Results:"
cat > my-pattern <<'EOF'
[nN][aA][mM][eE] *= *['"].*['"]
EOF
grep -f my-pattern $FILE
exit 0
producing:
Code:
% ./s1
Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution : Debian GNU/Linux 5.0
GNU bash 3.2.39
GNU grep 2.5.3
Data file data1:
name = "double-1"
Name = "double-2"
name = 'single-1'
name = none
name = 'single-2'
Results:
name = "double-1"
Name = "double-2"
name = 'single-1'
name = 'single-2'
Another method is to surround the regular expression on the command line with double quotes. Inside of double quotes you may have escaped double quotes, \", and single quotes. However, you may not have escaped single quotes within a single-quoted string.
See man pages for details. Good luck ... cheers, drl
i m trying the following command but its not working:
sed 's/find/\'replace\'/g' myFile
but the sed enters into new line
# sed 's/find/re\'place/g' myFile
>
I havn't any idea how to put single quote in my replace string. Your early help woud be appreciated. Thanx (2 Replies)
Hi Experts...
I am trying to find out separting the records which are staring with double quote(") and a six digit number(ex: 012456,987654,etc) from a file.
For example :
Source File :
"116462","SMITH CHEVR
"164098","SIMPS
"104498","SIMPSONVIL
"Export lments"
"Copyrts... (4 Replies)
Hi,
I search for the string below which contains a single quote,
some text '/home/myuser
in the file myfile.txt as another user with the grep command as follows
su - myuser -c "grep 'some text \'/home/myuser' myfile.txt"
I also tried using two backslashes
su - myuser... (6 Replies)
i want to replace mistaken quotes in line starting with tag 300 and relocate the quote in the correct position so the input is
223;25
224;20100428064823;1;0;0;0;0;0;0;0;8;1;3;9697;18744;;;;;;;;;;;;
300;X;Event:... (3 Replies)
Hello ,
I got html file , these file are normal html as we can see .
what i would like to do is in this html file , i want to print only string start with double quote and end with double quote by line by line.
<tr><td valign=top>25.</td><td><A... (8 Replies)
I need to check whether first character of variable is single quote.
I tried the below constructions but they are all not working (always return true)
if (test `echo "$REGEXP" |cut -c1` != "'"); then echo "TRUE"; fi
if (test `echo "$REGEXP" |cut -c1` != '\''); then echo "TRUE"; fi
if (test... (5 Replies)
Hi Froum.
I have tried in vain to find a solution for this problem - I'm trying to replace any double quotes within a quoted string with a single quote, leaving everything else as is.
I have the following data:
Before:
... (32 Replies)
Hi All ,
We have source data file as csv file and since data could contain commas ,each attribute is quoted into double quotes.However problem is that some of the attributa data also contain double quotes which is converted to double double quote while creating csv file
XLs data :
... (2 Replies)
From:
1,2,3,4,5,This is a test
6,7,8,9,0,"This, is a test"
1,9,2,8,3,"This is a ""test"""
4,7,3,1,8,""""
To:
1,2,3,4,5,This is a test
6,7,8,9,0,"This; is a test"
1,9,2,8,3,"This is a ''test''"
4,7,3,1,8,"''"Is there an easy syntax I'm overlooking? There will always be an odd number... (5 Replies)
Hello,
I'd like to print line if column 5th doesn't match with exm. But to reach there I have to make sure I match single quote.
I'm struggling to match that.
I've input file like:
Warning: Variants 'exm480340' and '5:137534453:G:C' have the same position.
Warning: Variants 'exm480345'... (9 Replies)
Discussion started by: genome
9 Replies
LEARN ABOUT DEBIAN
mojolicious::routes::pattern
Mojolicious::Routes::Pattern(3pm) User Contributed Perl Documentation Mojolicious::Routes::Pattern(3pm)NAME
Mojolicious::Routes::Pattern - Routes pattern engine
SYNOPSIS
use Mojolicious::Routes::Pattern;
# Create pattern
my $pattern = Mojolicious::Routes::Pattern->new('/test/:name');
# Match routes
my $result = $pattern->match('/test/sebastian');
say $result->{name};
DESCRIPTION
Mojolicious::Routes::Pattern is the core of Mojolicious::Routes.
ATTRIBUTES
Mojolicious::Routes::Pattern implements the following attributes.
"defaults"
my $defaults = $pattern->defaults;
$pattern = $pattern->defaults({foo => 'bar'});
Default parameters.
"format"
my $regex = $pattern->format;
$pattern = $pattern->format($regex);
Compiled regex for format matching.
"pattern"
my $pattern = $pattern->pattern;
$pattern = $pattern->pattern('/(foo)/(bar)');
Raw unparsed pattern.
"quote_end"
my $quote = $pattern->quote_end;
$pattern = $pattern->quote_end(']');
Character indicating the end of a quoted placeholder, defaults to ")".
"quote_start"
my $quote = $pattern->quote_start;
$pattern = $pattern->quote_start('[');
Character indicating the start of a quoted placeholder, defaults to "(".
"regex"
my $regex = $pattern->regex;
$pattern = $pattern->regex($regex);
Pattern in compiled regex form.
"relaxed_start"
my $relaxed = $pattern->relaxed_start;
$pattern = $pattern->relaxed_start('*');
Character indicating a relaxed placeholder, defaults to "#".
"reqs"
my $reqs = $pattern->reqs;
$pattern = $pattern->reqs({foo => qr/w+/});
Regex constraints.
"symbol_start"
my $symbol = $pattern->symbol_start;
$pattern = $pattern->symbol_start(':');
Character indicating a placeholder, defaults to ":".
"symbols"
my $symbols = $pattern->symbols;
$pattern = $pattern->symbols(['foo', 'bar']);
Placeholder names.
"tree"
my $tree = $pattern->tree;
$pattern = $pattern->tree([ ... ]);
Pattern in parsed form.
"wildcard_start"
my $wildcard = $pattern->wildcard_start;
$pattern = $pattern->wildcard_start('*');
Character indicating the start of a wildcard placeholder, defaults to "*".
METHODS
Mojolicious::Routes::Pattern inherits all methods from Mojo::Base and implements the following ones.
"new"
my $pattern = Mojolicious::Routes::Pattern->new('/:action');
my $pattern
= Mojolicious::Routes::Pattern->new('/:action', action => qr/w+/);
my $pattern = Mojolicious::Routes::Pattern->new(format => 0);
Construct a new pattern object.
"match"
my $result = $pattern->match('/foo/bar');
my $result = $pattern->match('/foo/bar', 1);
Match pattern against entire path, format detection is disabled by default.
"parse"
$pattern = $pattern->parse('/:action');
$pattern = $pattern->parse('/:action', action => qr/w+/);
$pattern = $pattern->parse(format => 0);
Parse a raw pattern.
"render"
my $path = $pattern->render({action => 'foo'});
my $path = $pattern->render({action => 'foo'}, 1);
Render pattern into a path with parameters, format rendering is disabled by default.
"shape_match"
my $result = $pattern->shape_match($path);
my $result = $pattern->shape_match($path, 1);
Match pattern against path and remove matching parts, format detection is disabled by default.
SEE ALSO
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>.
perl v5.14.2 2012-09-05 Mojolicious::Routes::Pattern(3pm)