Regular Expressions 101

Explanation

Pro

^start of string

Negative Lookahead(?!_)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 1([^\"#%$&*:`^+\[\]<>?\/{|}~]){1,123}

{1,123}repeats the group contents below between 1 and 123 times:

Negated Character Class[^\"#%$&*:`^+\[\]<>?\/{|}~]

\"the literal " (34₁₀ / 42₈ / 22₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

`the literal ` (96₁₀ / 140₈ / 60₁₆)

^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

~the literal ~ (126₁₀ / 176₈ / 7E₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2(docx|pptx|xlsx|pdf)

1st Alternativedocx

docxthe literal text docx (case sensitive)

2nd Alternativepptx

pptxthe literal text pptx (case sensitive)

3rd Alternativexlsx

xlsxthe literal text xlsx (case sensitive)

4th Alternativepdf

pdfthe literal text pdf (case sensitive)

$end of string, or before its final line terminator

Detailed match information will be displayed here automatically.

25 tokens

^(?!_)([^\"#%$&*:`^+\[\]<>?\/{|}~]){1,123}\.(docx|pptx|xlsx|pdf)$

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