MarcEdit Shelter-In-Place Webinar 6: Regular Expressions and .NET, A Primer

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Terry Reese

slides -- video at: https://youtu.be/0khvMJGIuzA

Education

MARCEDIT SHELTER-IN-
PLACE WEBINAR: REGULAR
EXPRESSIONS AND .NET, A
PRIMER

REGULAR EXPRESSION TESTER
HTTP://REGEXSTORM.NET/TESTER LANGUAGE REFERENCE:
HTTPS://DOCS.MICROSOFT.COM/EN-
US/DOTNET/STANDARD/BASE-TYPES/REGULAR-
EXPRESSION-LANGUAGE-QUICK-REFERENCE

$WHATAREREGULAREXPRESSIONS? • ^w+@[a-zA-Z_]+?.[a-zA-Z]{2,3}$ • [w-]+@([w-]+.)+[w-]+ • ^.+@[^.].*.[a-z]{2,}$ • ^([a-zA-Z0-9_-.]+)@(([[0-9]{1,3}.[0- • 9]{1,3}.[0-9]{1,3}.)|(([a-zA-Z0-9- • ]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$$

Literal Characters
j
Jack is a transformer

SPECIALCHARACTERS
if (true) {
if (true) {

CHARACTERCLASSES
[0-9a-fA-F]
e c de f e FFFFFF

SHORTHANDCHARACTERCLASSES
[0-9]
[A-Za-z0-9_]
[ trn]
[sd]
2 3

SHORTHANDCHARACTERCLASSES
[^d]
[^w]
[^s]
[D]
+ =

REPETITION
<[A-Za-z][A-Za-z0-9]*>
<HTML> <b>

REPETITION
</?[A-Za-z][A-Za-z0-9]*>
<HTML> <b> </b></HTML>

ANCHORS
tion$
vacation evacuation
has ruined my evaluation

ANCHORS
tionZ
vacation evacuation
has ruined my evaluation
A
$
Z
^

WORDBOUNDARIES
b4b
We’ve got 4 orders for 44 lbs of C4
b

WORDBOUNDARIES
BatB
vacation evacuation at that
time ate my evaluation
B

ALTERNATION
cat|dog
A cat and dog are expected to follow
the dogma that their presence with one
another leads to catastrophe.

ALTERNATION
bcat|dogb
A cat and dog are expected to follow
the dogma that their presence with one
another leads to catastrophe.

EAGERNESS
and|android
A robot and an android fight. The ninja wins.

GREEDINESS
anS+
A robot and an android fight. The ninja wins.

LAZINESS
anS+?
A robot and an android fight. The ninja wins.

LIMITINGREPETITION
d{2,4}
1 11 111 1111 11111

LIMITINGREPETITION
d{2,}
1 11 111 1111 11111
{0,} * {1,} +

LIMITINGREPETITION
d{4}
1 11 111 1111 11111

NAMEDGROUPS
(?<vowel>[ai]).k<vowel>.1
The magician said abracadabra!

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MarcEdit Shelter-In-Place Webinar 6: Regular Expressions and .NET, A Primer

1. MARCEDIT SHELTER-IN- PLACE WEBINAR: REGULAR EXPRESSIONS AND .NET, A PRIMER

2. REGULAR EXPRESSION TESTER HTTP://REGEXSTORM.NET/TESTER LANGUAGE REFERENCE: HTTPS://DOCS.MICROSOFT.COM/EN- US/DOTNET/STANDARD/BASE-TYPES/REGULAR- EXPRESSION-LANGUAGE-QUICK-REFERENCE

3. WHATAREREGULAREXPRESSIONS? • ^w+@[a-zA-Z_]+?.[a-zA-Z]{2,3}$ • [w-]+@([w-]+.)+[w-]+ • ^.+@[^.].*.[a-z]{2,}$ • ^([a-zA-Z0-9_-.]+)@(([[0-9]{1,3}.[0- • 9]{1,3}.[0-9]{1,3}.)|(([a-zA-Z0-9- • ]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$

4. LITERALCHARACTERS is is a transformer

5. LITERALCHARACTERS a a a transformer

6. Literal Characters j Jack is a transformer

7. SPECIALCHARACTERS

8. SPECIALCHARACTERS 1+1=2 1+1=2

9. SPECIALCHARACTERS if (true) { if (true) {

10. NON-PRINTABLECHARACTERS

11. PERIOD a.boy a boy

12. CHARACTERCLASSES [Gg]r[ae]y Gray grey

13. CHARACTERCLASSES [0-9a-fA-F] e c de f e FFFFFF

14. CHARACTERCLASSES o[^l] =003 OCoLC

15. CHARACTERCLASSES [+*] * +