regex101: PCRE2 (PHP) Match Workspace

Pro

Character Class[\]a-zA-Z0-9]

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group 1([^\.\]]+)

Negated Character Class[^\.\]]+

+matches at least one character outside the set below:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Group 2([\[a-zA-Z0-9])?

?repeats the group contents below at most once:

Character Class[\[a-zA-Z0-9]

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

25 tokens

Regular Expression

[\]a-zA-Z0-9]\[([^\.\]]+)\]([\[a-zA-Z0-9])?

New

should pass
$test[2]

$test.var2[4]
$test[0].var3.var4
$test[30].var5[30][3333].var6
$test[0].var7[3][4]
$test[0].var8.var9.var10

below should not pass
$test.var1
$test.var1.asd
test[]
test [0]
test/[0]
test/[0]/
test.[0]

Substitution

should pass
$test[2]

$test.var2[4]
$test[0].var3.var4
$test[30].var5[30][3333].var6
$test[0].var7[3][4]
$test[0].var8.var9.var10

below should not pass
$test.var1
$test.var1.asd
test[]
test [0]
test/[0]
test/[0]/
test.[0]