Tech learning roadmaps…

[jaathiratnalu]

Super thread 

@afdb_sai @psyc0pk please pin this thread

[dasari4kntr]

[dasari4kntr]

[Mr Mirchi]

great ba..nice work

[Balibabu]

Good work 

[Picheshwar]

  On 6/23/2022 at 10:50 AM, dasari4kntr said:

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future movie names

[dasari4kntr]

 

 

 

 

 

[MiryalgudaMaruthiRao]

ltt

[dasari4kntr]

[*Prince Charming]

Seriously good topic/thread....

[dasari4kntr]

[dasari4kntr]

 

[dasari4kntr]

 

[dasari4kntr]

Regular Expressions Cheat Sheet by DaveChild

 

A quick reference guide for regular expressions (regex), including symbols, ranges, grouping, assertions and some sample patterns to get you started.

 

 

Anchors ^ Start of string, or start of line in multi-line pattern \A Start of string $ End of string, or end of line in multi-line pattern \Z End of string \b Word boundary \B Not word boundary \< Start of word \> End of word Character Classes \c Control character \s White space \S Not white space \d Digit \D Not digit \w Word \W Not word \x Hexade­cimal digit \O Octal digit POSIX [:upper:] Upper case letters [:lower:] Lower case letters [:alpha:] All letters [:alnum:] Digits and letters [:digit:] Digits [:xdigit:] Hexade­cimal digits [:punct:] Punctu­ation [:blank:] Space and tab [:space:] Blank characters [:cntrl:] Control characters [:graph:] Printed characters [:print:] Printed characters and spaces [:word:] Digits, letters and underscore Assertions ?= Lookahead assertion ?! Negative lookahead ?<= Lookbehind assertion ?!= or ?<! Negative lookbehind ?> Once-only Subexp­ression ?() Condition [if then] ?()| Condition [if then else] ?# Comment

Quanti­fiers * 0 or more {3} Exactly 3 + 1 or more {3,} 3 or more ? 0 or 1 {3,5} 3, 4 or 5 Add a ? to a quantifier to make it ungreedy. Escape Sequences \ Escape following character \Q Begin literal sequence \E End literal sequence "­Esc­api­ng" is a way of treating characters which have a special meaning in regular expres­sions literally, rather than as special charac­ters. Common Metach­ara­cters ^ [ . $ { * ( \ + ) | ? < > The escape character is usually \ Special Characters \n New line \r Carriage return \t Tab \v Vertical tab \f Form feed \xxx Octal character xxx \xhh Hex character hh

Groups and Ranges . Any character except new line (\n) (a|b) a or b (...) Group (?:...) Passive (non-c­apt­uring) group [abc] Range (a or b or c) [^abc] Not (a or b or c) [a-q] Lower case letter from a to q [A-Q] Upper case letter from A to Q [0-7] Digit from 0 to 7 \x Group/­sub­pattern number "­x" Ranges are inclusive. Pattern Modifiers g Global match i * Case-i­nse­nsitive m * Multiple lines s * Treat string as single line x * Allow comments and whitespace in pattern e * Evaluate replac­ement U * Ungreedy pattern * PCRE modifier String Replac­ement $n nth non-pa­ssive group $2 "­xyz­" in /^(abc­(xy­z))$/ $1 "­xyz­" in /^(?:a­bc)­(xyz)$/ $` Before matched string $' After matched string $+ Last matched string $& Entire matched string Some regex implem­ent­ations use \ instead of $.

[dasari4kntr]