Regular Expressions 101

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Regular Expression
PCRE (PHP <7.3)

/
\A((?:[^{}]++|\{(?-1)\})*)+\Z
/
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Description

The string '{}' is valid while '{{}' is invalid as well as '}{'.

Now, is this one valid: '{{{{v{a{l{{i{d or }i}}}n}v}}al}i}d?' ?

Submitted by nowox - 9 years ago