Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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"
(\$array\[)([^+\]])(\])
"
gm
1st Capturing Group
(\$array\[)
\$ matches the character $ literally (case sensitive)
array matches the characters array literally (case sensitive)
\[ matches the character [ literally (case sensitive)
2nd Capturing Group
([^+\]])
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)
3rd Capturing Group
(\])
\] 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.

Regular Expression
No Match

r"
"
gm

Test String

Substitution

Processing...