Looking for a way to parse JavaScript code using Perl?
var materials ={
foo: "bar",
bar: "baz",
baz: "foo"
},
If you have the JavaScript variable as a string and need to extract the associative array's body for JSON parsing in Perl, you might be struggling with your regular expression:
my ($json_str) = $js_code =~ m/var\smaterials\s=\s+({.+}),/i;However, the $json_str remains uninitialized.
By extracting the JSON string from the JavaScript code using a regular expression, we can avoid issues with <code>.not matching\nby default. To address this, we can either use[\s\S]or enable theDOTALLflag with(?s).For a demonstration, you can check out the following links:
https://regex101.com/r/pT8uR7/3
or
If you're looking to extract the keys from a JSON object programmatically, consider utilizing JSON::Decode::Regexp which provides a regex pattern for matching JSON strings in Perl. This module not only matches the JSON but also loads it into a Perl hash for further processing. Here's an example of how to use it:
use Data::Dump;
use JSON::Decode::Regexp;
my $json_data = <<'END_JSON';
var items ={
"apple": "red",
"banana": "yellow",
"grape": "purple"
},
END_JSON
if ($json_data =~ /(\{.+)/s) {
local $_ = $1;
local $^R;
eval { /\A$JSON::Decode::Regexp::FROM_JSON/ } or die "No match";
die "No match: $@" if $@;
print "Match: "; dd $_;
}
The output will be:
Match: { apple => "red", banana => "yellow", grape => "purple" }
To exclude a group, using the syntax [^}]+ is effective even when dealing with multiple elements:
#!/usr/bin/env perl
my $js_code = <<'__END__';
var previousOne = {
pFoo: "pBar",
pBar: "pBaz",
pBaz: "pFoo"
},
var materials ={
foo: "bar",
bar: "baz",
baz: "foo"
},
var anotherOne = {
aFoo: "aBar",
aBar: "aBaz",
aBaz: "aFoo"
}
__END__
my ($json_str) = $js_code =~ m/\s*var\s+materials\s*=\s*({[^}]+}),?/;
print "json_str = ${json_str}\n";
Whitespace constraints have been relaxed for convenience. To test and modify the code online, you can visit the following link: here
Currently, there are no spaces between the equal sign and the curly bracket. However, in order to adhere to the pattern, at least one space is required. Consider removing the \s+ or replacing it with \s*.
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