Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
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/
@\[([^+\]\s])([^+\]])\]\([^+\)]\)
/
gm
@ matches the character @ literally (case sensitive)
\[ matches the character [ literally (case sensitive)
1st Capturing Group
([^+\]\s])
Match a single character not present in the list below
[^\]\s]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\] matches the character ] literally (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
2nd Capturing Group
([^+\]])
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 the character ] literally (case sensitive)
\] matches the character ] literally (case sensitive)
\( matches the character ( literally (case sensitive)
Match a single character not present in the list below
[^\)]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\) matches the character ) literally (case sensitive)
\) matches the character ) literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String

Substitution

Processing...