======Perl - Regularni vyrazy======

====Akce s regularnimi znakami====
$RETEZEC =~ s/TEXT1/TEXT2/; ... zameni prvni vyskyt TEXT1 na radku textem TEXT2\\
$RETEZEC =~ s/TEXT1/TEXT2/g; ... zameni kazdy vyskyt TEXT1 na radku textem TEXT2\\
$RETEZEC =~ s/TEXT1/TEXT2/gi; ... zameni kazdy vyskyt text1 (nerozlisuje velka/mala pismena) na radku textem TEXT2\\
if( m/TEXT/ ) ... Vyhledavani pomoci regularnich znaku\\

====Metaznaky====
^ ...	zacatek retezce\\
$ ...	konec retezce\\
. ...	any character except newline\\
a* ...	vyskyt znaku a 0 krat nebo vicekrat\\
+ ...	vyskyt znaku a 1 krat nebo vicekrat\\
? ...	match 0 or 1 times; or: shortest match\\
a? ...	zero or one a’s (i.e., optional a)\\
repetition? ...	same as repetition but the shortest match is taken\\
| ...	alternativa\\
( ) ...	grouping; “storing”\\
[ ] ...	mnozina znaku\\
[abc] 	libovalny ze znaku: abc\\
[0-9] 	Libovlany ze znaky 0 az 9 podle asci tabulky\\
[\-]	znak pomlcka\\
[\n]	znak novy radek\\
[^abc] 	cokoliv, krome znaku abc\\
a{3} ... znak a 3x po sobe\\
a{2,} ... znak a alespon 2x po sobe\\
a{2,3} ... znak a 2x az 3x\\
\ ...	quote or special\\

====Specialni lomitkove znaky====
\t 	tabulator\\
\n 	novy radek\\
\r 	navrat na zacatek radku (CR)\\
\xhh 	znak pode sestnactkoveho kodu hh\\
\b 	“word” boundary\\
\B 	not a “word” boundary\\
\w 	slovni znak - ekvivalent [a-zA-Z_]\\
\W 	ne slovni znak\\
\s 	prazdny znak (mezera, tabulator, novy radek)\\
\S 	znak, jez neni prazdny znak\\
\d 	ciselny znak - ekvivalent [0-9]\\
\D 	Neciselny znak\\

====Priklady regularnich znaku====
<code>
abc 	abc (that exact character sequence, but anywhere in the string)
^abc 	abc at the beginning of the string
abc$ 	abc at the end of the string
a|b 	either of a and b
^abc|abc$ 	the string abc at the beginning or at the end of the string
ab{2,4}c 	an a followed by two, three or four b’s followed by a c
ab{2,}c 	an a followed by at least two b’s followed by a c
ab*c 	an a followed by any number (zero or more) of b’s followed by a c
ab+c 	an a followed by one or more b’s followed by a c
ab?c 	an a followed by an optional b followed by a c; that is, either abc or ac
a.c 	an a followed by any single character (not newline) followed by a c
a\.c 	a.c exactly
[abc] 	any one of a, b and c
[Aa]bc 	either of Abc and abc
[abc]+ 	any (nonempty) string of a’s, b’s and c’s (such as a, abba, acbabcacaa)
[^abc]+ 	any (nonempty) string which does not contain any of a, b and c (such as defg)
\d\d 	any two decimal digits, such as 42; same as \d{2}
\w+ 	a “word”: a nonempty sequence of alphanumeric characters and low lines (underscores), such as foo and 12bar8 and foo_1
100\s*mk 	the strings 100 and mk optionally separated by any amount of white space (spaces, tabs, newlines)
abc\b 	abc when followed by a word boundary (e.g. in abc! but not in abcd)
perl\B 	perl when not followed by a word boundary (e.g. in perlert but not in perl stuff)
</code>