PHP Common Regular Expression code

is in fact also snobbish, cut the point to put the money; (refers to the beginning symbol ^ and the end sign $) 2 L. @4 t# N) ~ (B
Special symbols do not recognize, get a back bar to guide the way (refers to. * and other special symbols) 0 B4 W0} (D2 m) i) O
behind the back with the small W, the number of letters to express; (w with digital letters; d with numbers)
1 V3 r& A + B + K T X;? Behind the bar with small d, only numbers to indicate;
% K,/D7]$ D9 E0 w-a back with small a, alarm symbol beep;! X) H6 B K3 i "v% | ' _
behind the bar with small B, word demarcation or backspace; P6 ^! u) o ' ^ o
behind the back with the small T, the tab symbol is very clear;& H5 X (m+ _ (k& y
behind the back with small R, carriage return symbol known;)] " ~4 _)}2 W; F
behind the back with small s, the space symbol is very important;% D0 d+ R6 _ (N4? 4 M
lower case with a capital, a lot of it is really not got; 2 ["R5}7 U1 {, M6 J" v. H4 a# i
behind the back with the Big W, the letter number aside;
1 U7 ~0 {1 |8 G7 ' # P6 Z back with big S, white space is also on the sidelines; 5 U ' A (with $ B9 M (d0 p# G
behind the bar with Big D, the number from the sidelines;
9 L6 [4 [(K5 A) V4 _ The back of the box with Big B, excluding the beginning and end;% L2 S) ~;] S4 r/h: G2 J

1 y '?; c% @ "J6 H single character to repeat, three symbols to help; ) $ + Q3 F8 G) B4 T; w# Q '
0 stars plus 1 to infinity, the question mark only 0 and 1; (* table 0-n;+ table 1-n;? Table 0-1 repetitions) ']4 G2 L:] "V
more learning in curly braces, strong repetitive operation ({n} {N,} {n,m}) 8 y/y;] 2 V (Q0 U9 o$ c
to repeat the string, enclose it in the garden; ((ABC) {3} indicates that the string "abc" repeats 3 times)
! Q ' j! |8 s ' l9 I special set Custom, bracket to help you;& R5 D9 i+ G7?
escape symbol not workable, one to line up;
% Z (! | ' y, Z2 e$ i# p3 S0 ~ "-Q is really too much to row, cross bar please help a busy; ([1-5]) ' X, d y, o# n e* P
A sharp point is placed in brackets, and the definition of antisense is powerful; ([^a] refers to any character other than "a")
6 u/s: v;  [6 | I2 W9 O1 Vertical action is not small, the two sides are mutually replacement; (on the keyboard and "" is the same key)
# j! ' 3 F. r* |3 k# F1 can be used many times, complex definition is very convenient; 5 t+ B8 S ' |3 L. @8 Y8 Z0 o
Square brackets, multi-purpose;-y* K r! X8 W6 z+ C9 y1 u:g$ v$ F
A reverse reference to the specified group, with numeric rows corresponding to it; (The number "1" in "B (w+) bs+1b" refers to the preceding "(w+)") (O5 P "@& U8]7 L
Support Group name customization, question mark with angle bracket, ("(? <word>w+)" "w+" defined as group, group named "Word")
3 J. P2 G:t5 V9 B-bracket, with many uses, location designation depends on it;! L! Y6 W6; b* l+ W
question mark equals string, positioned before the string ("bw+ (? =ingb)" Locates the string before "ing")
! B7 ~5 X1 c:r, y to locate the string, insert a less than number in the middle, ("(? <=bsub) W+b" Locate the string after "sub")
8 I2 F1 Y2 R, J9 M1 J question mark add an exclamation point, followed by string strings;
1 m$ n%: d+ @9 1 O:yphper all know,! is to take the opposite meaning; (E% C; J "X:c q:m& T" M
back not with this string, all meet to report; ("W*d!" OG) w* "," dog "does not meet," do "in accordance with"
6 @9 T7 B7 f$ g (Z)} The question mark is less than the exclamation point followed by string strings;
! ~; E-n ' U5 o not put this string in front, all meet to report; 1 T i/? ' i3 m+ I2 x
dot asterisk is greedy, add a question mark not greedy; # o+ M "?: | ' E. v/t
the plus question mark has the guarantee, at least repeat more than once;
0 G9 e3 Y7 d! x9 g$ t& n Two question marks, 0 times 1 times; @* Q5 V ' E8 |/g
curly braces followed by a? , greed becomes not greedy;