RegExLib.com Regular Expression Cheat Sheet (.NET)

Metacharacters Defined Metacharacter Examples
^ Start of a string. ^abc abc, abcdefg, abc123, …
$ End of a string. abc$ abc, endsinabc, 123abc, …
0 Any character (except \n newline) a.c abc, aac, acc, adc, aec, …
| Alternation. bill|ted ted, bill
{…} Explicit quantifier notation. ab{2}c abbc
[…] Explicit set of characters to match. a[bB]c abc, aBc
(…) Logical grouping of part of an expression. (abc){2} abcabc
* 0 or more of previous expression. ab*c ac, abc, abbc, abbbc, …
+ 1 or more of previous expression. ab+c abc, abbc, abbbc, …
? 0 or 1 of previous expression; also forces minimal matching when an expression might match several strings within a search string. ab?c ac, abc
\ Preceding one of the above, it makes it a literal instead of a special character. Preceding a special matching character, see below. a\sc a c

 

Character Escapes http://tinyurl.com/5wm3wl
ordinary characters Characters other than . $ ^ { [ ( | ) ] } * + ? \ match themselves.
\a Matches a bell (alarm) \u0007.
\b Matches a backspace \u0008 if in a []; otherwise matches a word boundary (between \w and \W characters).
\t Matches a tab \u0009.
\r Matches a carriage return \u000D.
\v Matches a vertical tab \u000B.
\f Matches a form feed \u000C.
\n Matches a new line \u000A.
\e Matches an escape \u001B.
\040 Matches an ASCII character as octal (up to three digits); numbers with no leading zero are backreferences if they have only one digit or if they correspond to a capturing group number. (For more information, see Backreferences.) For example, the character \040 represents a space.
\x20 Matches an ASCII character using hexadecimal representation (exactly two digits).
\cC Matches an ASCII control character; for example \cC is control-C.
\u0020 Matches a Unicode character using a hexadecimal representation (exactly four digits).
\* When followed by a character that is not recognized as an escaped character, matches that character. For example, \* is the same as \x2A.

 

Character Classes http://tinyurl.com/5ck4ll
0 Matches any character except \n. If modified by the Singleline option, a period character matches any character. For more information, see Regular Expression Options.
[aeiou] Matches any single character included in the specified set of characters.
[^aeiou] Matches any single character not in the specified set of characters.
[0-9a-fA-F] Use of a hyphen (–) allows specification of contiguous character ranges.
\p{name} Matches any character in the named character class specified by {name}. Supported names are Unicode groups and block ranges. For example, Ll, Nd, Z, IsGreek, IsBoxDrawing.
\P{name} Matches text not included in groups and block ranges specified in {name}.
\w Matches any word character. Equivalent to the Unicode character categories [\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}]. If ECMAScript-compliant behavior is specified with the ECMAScript option, \w is equivalent to [a-zA-Z_0-9].
\W Matches any nonword character. Equivalent to the Unicode categories [^\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{Pc}]. If ECMAScript-compliant behavior is specified with the ECMAScript option, \W is equivalent to [^a-zA-Z_0-9].
\s Matches any white-space character. Equivalent to the Unicode character categories [\f\n\r\t\v\x85\p{Z}]. If ECMAScript-compliant behavior is specified with the ECMAScript option, \s is equivalent to [ \f\n\r\t\v].
\S Matches any non-white-space character. Equivalent to the Unicode character categories [^\f\n\r\t\v\x85\p{Z}]. If ECMAScript-compliant behavior is specified with the ECMAScript option, \S is equivalent to [^ \f\n\r\t\v].
\d Matches any decimal digit. Equivalent to \p{Nd} for Unicode and [0-9] for non-Unicode, ECMAScript behavior.
\D Matches any nondigit. Equivalent to \P{Nd} for Unicode and [^0-9] for non-Unicode, ECMAScript behavior.

Read more

How to migrate Raspberry Pi 5 OS from micro SD to NVME m.2 SSD

首先我買了Raspberry Pi CM5後來買了Raspberry Pi CM5 I/O board來當個人電腦使用,系統是安裝在256GB SD卡上運行的很好。用久了在開啟較肥的程式像Web Browser或LiberOffice會有慢半拍的反應,而有了升級NVME m.2 SSD念頭。 因為Raspberry Pi 5支援的最快PCIe gen3 x 4就不去考慮快的Gen4 or Gen5 m.2 SSD。找了ADATA出的 LEGEND 710入門級的產品,會利用HMB(Host Memory Buffer)來加速I/O速度,因為是Raspberry Pi OS kernel會認不得而無法正常使用 事先在SD卡的/boot/firmware/cmdline.txt 加入 kernel command line參數如下,然後重開機m.

By Phillips Hsieh

How to document Home Lab and Network

運維機房和跨域的網路,會遇到各式需求與問題,用對工具才能分析問題,個人覺得最重要的是使用能處理問題的工具。 推薦目前想學和正在使用的平台與軟體,協助將公司/家用機房文件化 佈告欄任務管理 Focalboard 白板可管理任務指派 網路架構文件編寫 netbox 精細管理網路設備與連接線路 IP 資源管理 phpipam 專注網路IP分配 邏輯塊文件編寫 draw.io 視覺化概念圖 機房設備管理 ITDB 管理設備生命週期與使用者

By Phillips Hsieh

如何在Raspberry Pi4上安裝Proxmox for ARM64

第一步 準備好Raspberry Pi 4 / CM4 4GB RAM,這裡要留意CM4如果是買有內建eMMC storage會限制不能使用SD卡開機而限制本地空間容量,如果沒有NAS外接空間或使用USB開機的話,建議買CM4 Lite插上大容量SD卡 第二步 去Armbian官網下載最小化Debian bookworm image https://www.armbian.com/rpi4b/ Armbian 25.2.2 Bookworm Minimal / IOT 然後寫入SD/USB開機碟,寫入方法參考官方文件 https://github.com/raspberrypi/usbboot/blob/master/Readme.md Note: 官方提供的預先設定系統方法,可以在Armbian初次啟動自動化完成系統設定。連結在此 https://docs.armbian.com/User-Guide_Autoconfig/

By Phillips Hsieh

世界越快心越慢

在晚飯後的休息時間,我特別享受在客廳瀏灠youtube上各樣各式創作者的影音作品。很大不同於傳統媒體,節目多是針對大多數族群喜好挑選的,在youtube上我會依心情看無腦的動畫、一些旅拍記錄、新聞時事談論。 尤其在看了大量的Youtube的分享後,我真的感受到會限制我的是我的無知,特別是那些我想都沒想過的實際應用,在學習後大大幫助到我的生活和工作層面。 休息在家時,我喜歡想一些沒做過的菜,動手去設計生活和工作上的解決方案,自己是真的很難閒著沒事做。 如創作文章,陪養新的習慣都能感覺到成長的喜悅,是不同於吃喝玩樂的快樂的。 創作不去限制固定的形式,文字是創作、影像聲音也是創作,記錄生活也是創作,我想留下的就是創造—》實現—》回憶,這樣子的循環過程,在留下的足跡面看到自己一路上的成長、失敗、絕望、重新再來。 雖然大部份的時候去做這些創作也不明白有什麼特別的意義,但不去做也不會留下什麼,所以呀不如反事都去試試看,也許能有不一樣的水花也許有意想不到的結果,投資自己永遠不會是失敗的決定,不是嗎?先問問自己再開始計畫下一步,未來沒人說得準。 像最近看youtube仍大一群人在為DOS開

By Phillips Hsieh