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Add escaping special character

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Zeeshan Ahmed 2017-07-24 10:33:42 +01:00
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@ -30,6 +30,7 @@ contains uppercase letter and also it is too short.
- [The Question Mark]()
- [Character Group]()
- [Alternation]()
- [Escaping special character]()
- [Quantifiers]()
- [OR operator]()
- [Character Sets]()
@ -202,4 +203,16 @@ or lowercase character `c`, followed by lowercase character `a`, followed by low
<pre>
"[T|t]he|car" => <a href="#learn-regex"><strong>The</strong></a> <a href="#learn-regex"><strong>car</strong></a> is parked in <a href="#learn-regex"><strong>the</strong></a> garage.
</pre>
## 2.6 Escaping special character
Backslash `\` is used in regular expression to escape the next character. This allows to to specify a symbol as a matching character
including reserved characters `{ } [ ] / \ + * . $ ^ | ?`. To use a special character as a matching character prepend `\` before it.
For example the regular expression `.` is used to match any character except new line. Now to match `.` in an input string the regular
expression `[f|c|m]at\.?` means: lowercase letter `f`, `c` or `m`, followed by lowercase character `a`, followed by lowercase letter
`t`, followed by optional `.` character.
<pre>
"[f|c|m]at\.?" => The <a href="#learn-regex"><strong>fat</strong></a> <a href="#learn-regex"><strong>cat</strong></a> sat on the <a href="#learn-regex"><strong>mat.</strong></a>
</pre>