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 Topic: Using regex results, if backreference exists include FOO |
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csdude55
Joined: 22 Jan 2023
Posts: 23
Location: USA, Wilkesboro
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 Posted: Tue 21 Feb '23 23:56 Post subject: Using regex results, if backreference exists include FOO |
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In plain English, I'm trying to say "if 'string' starts with 'abc', set a variable of '<b>abc</b>remainder'. If it doesn't, set a variable of the entire value".
Surrounding "abc" with <b></b> is where I get hung up. The only way I can figure to do this in Apache is with two SetEnvIfExpr:
| Code: | # not tested, please forgive any typos
SetEnvIfExpr "env('string') =~ /(^abc)(.+)/" var=<b>$1</b>$2
SetEnvIfExpr "-z env('var') && env('string') =~ /(.+)/" var=$1 |
In Perl I would probably do something like:
| Code: | $string =~ s/^(abc)(.+)/foo($1)/ei;
sub foo {
return ($_[0] eq 'abc') ?
'<b>abc</b>' :
$_[0];
} |
Is the best method in Apache to use two SetEnvIfExpr like that? |
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James Blond
Moderator
Joined: 19 Jan 2006
Posts: 7371
Location: Germany, Next to Hamburg
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| Posted: Wed 22 Feb '23 10:55 Post subject: |
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If the URL query starts with abc, set your variable to abc
| Code: |
<LocationMatch ^/i.php>
<If "%{QUERY_STRING} =~ /^abc/">
SetEnv var "abc"
</If>
</LocationMatch>
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covener
Joined: 23 Nov 2008
Posts: 59
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| Posted: Tue 28 Feb '23 4:42 Post subject: Re: Using regex results, if backreference exists include FOO |
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you can use negative lookahead to simplify (in some sense)
| Code: | SetEnvIf string (^abc)(.+) var=<b>$1</b>$2
SetEnvIf string ^(?!abc)(.+) var=$1
# testing only
SetEnvIfExpr "%{QUERY_STRING} =~ /(.*)/" string=$1
Header always set string %{string}e env=string
Header always set var %{var}e env=var |
| Code: |
$ wget -S http://localhost/ http://localhost/?xxabc http://localhost/?abcdef 2>&1 |egrep "(var|string)"
string:
string: xxabc
var: xxabc
string: abcdef
var: <b>abc</b>def |
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