Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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/
^\{{19}(\{[^+{}]\})\}{19}$
/
mg
^ asserts position at start of a line
\{
matches the character { literally (case sensitive)
{19} matches the previous token exactly 19 times
1st Capturing Group
(\{[^+{}]\})
\{ matches the character { literally (case sensitive)
Match a single character not present in the list below
[^{}]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
{} matches a single character in the list {} (case sensitive)
\} matches the character } literally (case sensitive)
\}
matches the character } literally (case sensitive)
{19} matches the previous token exactly 19 times
$ asserts position at the end of a line
Global pattern flags
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
mg

Test String