Regular Expressions 101

^start of string

Negative Lookahead(?!.*([^])(.*\1){3}]?)

.*any character (except for line terminators), repeated any number of times

Group 1([^])

[^]any character, including newline

Group 2(.*\1){3}

{3}repeats the group contents below exactly 3 times:

.*any character (except for line terminators), repeated any number of times

\1the text saved by group 1

]?optionally matches the literal ] (93₁₀ / 135₈ / 5D₁₆)

Character Class[$$[-^?!!.'''-*11{33}5577\\-]{57}

{57}matches exactly 57 characters from the set below:

$the literal $ (36₁₀ / 44₈ / 24₁₆)

[-^one character from [ (91₁₀) to ^ (94₁₀)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

'-*one character from ' (39₁₀) to * (42₁₀)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

7the literal 7 (55₁₀ / 67₈ / 37₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$end of string

Detailed match information will be displayed here automatically.

26 tokens

Regular Expression

^(?!.*([^])(.*\1){3}]?)[$$[-^?!!.'''-*11{33}5577\\-]{57}$

New

\])(.37}$]?)[$^-1{3){3}}5]{5.*([^75'-'-*1(?!7\$['^?!*\1!.