Regular Expressions 101

Pro

Character Class[A-Z]

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

Positive Lookbehind(?<=".|\.\s.|^.)

1st Alternative".

"the literal " (34₁₀ / 42₈ / 22₁₆)

.any character (except for line terminators)

2nd Alternative\.\s.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\sany whitespace character

.any character (except for line terminators)

3rd Alternative^.

^start of line

.any character (except for line terminators)

Negative Lookbehind(?<![MD]r\. .)

Character Class[MD]

Mthe literal M (77₁₀ / 115₈ / 4D₁₆) (case sensitive)

Dthe literal D (68₁₀ / 104₈ / 44₁₆) (case sensitive)

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

.any character (except for line terminators)

Non-Capturing Group(?:[A-Z]*[a-z]*){2}

{2}repeats the group contents below exactly 2 times:

Character Class[A-Z]*

*matches any number of characters from the set below:

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

Character Class[a-z]*

*matches any number of characters from the set below:

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

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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25 tokens

[A-Z](?<=".|\.\s.|^.)(?<![MD]r\. .)(?:[A-Z]*[a-z]*){2}

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