Java Regular expression (regular)

Oh, mom, it hurts----regular expression

The regular is used to handle complex text types.

Standard Character Set:

\d---> stands for 0-9 any number \d----> any character except the number \w-----> Letter (case) number, underline full match \w-----> all characters except alphanumeric underscore

\s-----> spaces, line breaks, tabs

\s-----> All characters except the Space wrap tab

.  -----> match any character except line break

Custom Character Set (* *)

Use the [] match method, match the characters within [],  use ^ in [] to  indicate the inverse  -to indicate from which to which interval

[[email protected]]-----> match the characters of Q or P or 3 or @

[A-f]------> match characters between a-f

[^a-v0-7]----> matches characters in addition to A-v 0-7

Use of quantifiers: special symbols for modifying the number of matches

{n}----> expression repeats n times
\D{6}: Match 6 digits
{\d\d} {6}: Match 12 digits
{M,n}----> expression repeats at least m times, the maximum repetition n times   is greedy mode, if there are N times will continue to append n times

{m,n}? -----> Repeat M-times, non-greedy mode

{m,}-------> at least m times, m+ is counted

？ ---------> Match Expression 0 or one time equals {0,1}
A/d?b: Match AB a5b
+----------> At least one time   equals {1}
A/d+b: Matching a2b a34b

*  ----------> is equivalent to {0}

Character bounds: is the position, not the character

^------> Character Start place
^o: string starting with O
$------> where the string ends
o$: string ending with O
\b------> Not all is/w's expression.
qw\b: Only this QW 123QW is configured

Mobile phone number Matching

1[358]\B{9}  starts with------1, and the 2nd bit can be 3.5.8 Other 9 digits

Mailbox match

[\w\-] [Email protected] [A-za-z0-9]+ (\.[ a-za-z]{2,5}) {}

Common regular matches

Java uses the regular:

Create a regular expression and matcher two objects using the Pattern under the Java.util package

Pattern p= pattern.compile ("\\d"); To create a regular expression

MATCHR m =p.matcher ("ddeff34");//need to match the regular

while (M.find ()) {

M.group ();//Remove

}

Java Regular expression (regular)