Extracting all values between curly braces regex php

Question

I have content in this form

$content =\"
This is a sample text where {123456} and {7894560} [\'These are samples\']{145789}
\";

Answer 1

Two compact solutions weren't mentioned:

(?<={)[^}]*(?=})

and

{\K[^}]*(?=})

These allow you to access the matches directly, without capture groups. For instance:

$regex = '/{\K[^}]*(?=})/m';
preg_match_all($regex, $yourstring, $matches);
// See all matches
print_r($matches[0]);

Explanation

• The (?<={) lookbehind asserts that what precedes is an opening brace.
• In option 2, { matches the opening brace, then \K tells the engine to abandon what was matched so far. \K is available in Perl, PHP and R (which use the PCRE engine), and Ruby 2.0+
• The [^}] negated character class represents one character that is not a closing brace,
• and the * quantifier matches that zero or more times
• The lookahead (?=}) asserts that what follows is a closing brace.

Reference

• Lookahead and Lookbehind Zero-Length Assertions
• Mastering Lookahead and Lookbehind