| Symbols |
|
|
| literal |
Match literal string valueliteral |
foo |
| re1|re2 |
Match regular expressionsre1 or re2 |
foo|bar |
| . |
Matchany character (except NEWLINE) |
b.b |
| ^ |
Match start of string |
^Dear |
| $ |
Match end of string |
/bin/*sh$ |
| * |
Match 0 or more occurrences of preceding RE |
[A-Za-z0-9]* |
| + |
Match 1 or more occurrences of preceding RE |
[a-z]+.com |
| ? |
Match 0 or 1 occurrence(s) of preceding RE |
goo? |
| {N} |
Match N occurrences of preceding RE |
[0-9]{3} |
| {M,N} |
Match from M to N occurrences of preceding RE |
[0-9]{5,9} |
| [...] |
Match any single character fromcharacter class |
[aeiou] |
| [..x-y..] |
Match any single character in therange fromx to y |
[0-9],[A-Za-z] |
| [^...] |
Do not match any character from character class,including any ranges,if present |
[^aeiou],[^A-Za-z0-9_] |
| (*|+|?| {})? |
Apply "non-greedy" versions of above occurrence/repetition symbols (*,+,?,{}) |
.*?[a-z] |
| (...) |
Match enclosed RE and save assubgroup |
([0-9]{3})?,f(oo|u)bar |
| Special Characters |
|
|
| d |
Match any decimal digit,same as [0-9](D is inverse of d: do not match any numeric digit) |
datad+.txt |
| w |
Match any alphanumeric character,same as [A-Za-z0-9_] (W is inverse ofw) |
[A-Za-z_]w+ |
| s |
Match any whitespace character,same as [ ntrvf] (S is inverse ofs) |
ofsthe |
| b |
Match any word boundary (B is inverse of b) |
bTheb |
| nn |
Match saved subgroup nn (see (...) above) |
price: 16 |
| c |
Match any special character c verbatim (i.e.,with out its special meaning,literal) |
.,,* |
| A (Z) |
Matchstart (end) of string (also see ^ and $ above) |
ADear |
