版本
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Anchors | |
|---|---|
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^ |
Start of string, or start of line in multi-line pattern |
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$ |
End of string, or end of line in multi-line pattern |
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\b |
Word boundary |
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\B |
Not word boundary |
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Character Classes | |
|---|---|
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\s |
White space |
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\S |
Not white space |
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\d |
Digit |
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\D |
Not digit |
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\w |
Word |
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\W |
No Word |
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\x |
Hexadecimal digit (Used for matching hex code characters, such as "\xA9", as in "0xA9", for the copyright symbol; or "\x5B", as in "0x5B", for the open square bracket.) |
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Quantifiers | |
|---|---|
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* |
White space |
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+ |
Not white space |
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? |
Digit |
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{3} |
Exactly 3 |
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{3,} |
3 or more |
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{3,5} |
3, 4, or 5 |
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Escape Sequences | |
|---|---|
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\ |
Escape following character ^ [ . $ { * ( \ + ) | ? < > |
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Special Characters | |
|---|---|
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\n |
New line |
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\r |
Carriage return |
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\t |
Tab |
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Groups and Ranges | |
|---|---|
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. |
Any character except new line (\n) |
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\r |
Carriage return |
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(a|b) |
a or b |
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(...) |
Group |
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(?:...) |
Passive (non-capturing) group |
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[abc] |
Range (a or b or c) |
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[^abc] |
Not (a or b or c) |
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[a-q] |
Lower case letter from a to q |
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[A-Q] |
Upper case letter from A to Q |
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[0-7] |
Digit from 0 to 7 |
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String Replacement | |
|---|---|
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$n |
nth non-passive group |
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$2 |
"xyz" in /^(abc(xyz))$/ |
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$1 |
"xyz" in /^(?:abc)(xyz)$/ |
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$` |
Before matched string |
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$' |
After matched string |
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$+ |
Last matched string |
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$& |
Entire matched string |