Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Introduction to Regular Expression
Search
N@N
September 21, 2013
Technology
0
340
Introduction to Regular Expression
姫路IT系勉強会 Vol.20で発表した内容に加筆・修正を加えたものです.
N@N
September 21, 2013
Tweet
Share
More Decks by N@N
See All by N@N
introduction to modern numerical analysis
spark6251
0
150
Finite Automaton equivalents to Regular Expression
spark6251
0
120
Programmer and English
spark6251
0
110
Let's go to the study session
spark6251
0
100
Quantum Computation
spark6251
0
270
Introduction to use Grunt
spark6251
0
86
Introduction to SCSS+COMPASS
spark6251
0
280
Introduction to Psychology
spark6251
1
270
Introduction to HTML5
spark6251
0
280
Other Decks in Technology
See All in Technology
How to Quickly Call American Airlines®️ U.S. Customer Care : Full Guide
flyaahelpguide
0
240
スタックチャン家庭用アシスタントへの道
kanekoh
0
110
Zero Data Loss Autonomous Recovery Service サービス概要
oracle4engineer
PRO
2
7.8k
AWS CDKの仕組み / how-aws-cdk-works
gotok365
10
890
オーティファイ会社紹介資料 / Autify Company Deck
autifyhq
10
130k
CDKコード品質UP!ナイスな自作コンストラクタを作るための便利インターフェース
harukasakihara
2
200
United Airlines Customer Service– Call 1-833-341-3142 Now!
airhelp
0
180
OpenTelemetryセマンティック規約の恩恵とMackerel APMにおける活用例 / SRE NEXT 2025
mackerelio
3
1.6k
マーケットプレイス版Oracle WebCenter Content For OCI
oracle4engineer
PRO
3
980
Contributing to Rails? Start with the Gems You Already Use
yahonda
2
120
助けて! XからWaylandに移行しないと新しいGNOMEが使えなくなっちゃう 2025-07-12
nobutomurata
2
140
20250708オープンエンドな探索と知識発見
sakana_ai
PRO
4
860
Featured
See All Featured
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
15
1.6k
It's Worth the Effort
3n
185
28k
Visualization
eitanlees
146
16k
Imperfection Machines: The Place of Print at Facebook
scottboms
267
13k
BBQ
matthewcrist
89
9.7k
Statistics for Hackers
jakevdp
799
220k
[RailsConf 2023 Opening Keynote] The Magic of Rails
eileencodes
29
9.6k
Producing Creativity
orderedlist
PRO
346
40k
For a Future-Friendly Web
brad_frost
179
9.8k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
26k
Why You Should Never Use an ORM
jnunemaker
PRO
58
9.4k
GraphQLの誤解/rethinking-graphql
sonatard
71
11k
Transcript
None
• • • • •
• • • • •
• •
• • • •
• . • • • •
• • •
• • • •
• • • • $ egrep [option] 'regex' file1 file2...
• $ egrep '[0-9]{3}-?[0-9]{4}' file01 • 1000 14 • validator
• Number::ZipCode::JP
• • • • •
• ^ • • '^cat' • •
• $ • • 'cat$' • •
• '^$' • • • '^cat$' • •
• '^' • • • '$' • •
• [...] • • 'gr[ae]y' • • •
• • '[0123456789]' = '[0-9]' • '[ABCDE...Z]' = '[A-Z]' •
'[abcde...z]' = '[a-z]' • '[012...9ABCDEFabcdef]' = '[0-9A-Fa-f]' • • [Ss]mith' blacksmith
• [^...] • • • '[^0-9]' • •
• $ egrep 'A[^B]' file01 • • •
• . • • 'A.B' •
• | • • 'gr[ae]y' = 'gr(a|e)y' = 'gray|grey' •
'gra|ey' gra ey • '[a|e]' a | e
• • • $ egrep -i 'from|to' file = $
egrep '[Ff][Rr][Oo][Mm]|[Tt][Oo]' file
• ¥<string¥> • egrep • the quick brown_ fox's $190.3?
$!?. •
• ? • • • • 'colou?r' • • '1st|1'
= '1(st)?'
• + • • * • • 'A+' = 'AA*'
• 'AA*' ≠ '(AA)*'
• ¥char • • '¥.' •
^ $ . [ABC] [^ABC] [A-Z] [^A-Z] c1|c2
+ * ? {n} {n,} {,m} {n,m} () ¥char
• • • • •
•
• •
• m • m/regex/mods • • s/regex/replacement/mods • • value
=~ /regex/mods • •
• /i • /x • /g
• • • ¥<(.*?)>.*?</¥1>¥ • <a>sdad</a> <list>dfasj</list>
• if($str =~ /(.*)?/) { print $1; # () }
$ perl [option] '[perlScript]' file01 • -e • -n 1
• -p • -l • -i
$ perl -i'*.back' -e '[perlScript]' file
$ find . -type f -print0 | xargs -0 sed
-i -e 's/foo/bar/g' $ git grep -l 'foo' | xargs -0 sed -i -e 's/foo/bar/g' $ git ls-files -z | xargs -0 sed -i -e 's/foo/bar/g'
• • • •
•
• • • •
• • • •
• • • •
• • • •
• • • • •
None
• • • •
• • • • • • • •
• • • • • • •
• • • • • • •
• • • •
None
• • • •
• • • • •
None
• • •
None
• •
None
• •
• •
• •
None
• •
• •
• • • • • • •
• • • •
• 'nfa|nfa not' • •
• 'X(.+)+X' • • • •
• • 'a.*b'
• • '^.*' •
• • 'to(nite|knight|night)' • •
• • • 'to(nite|knight|night)'
• • • • • •
• • • •
• • • •
• •
• • • • • •
None