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Could someone please give a complete list of special characters that should be escaped?
I fear I don't know some of them.
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Operators: * , + , ? , | Anchors: ^ , $ Others: . , \ In order to use a literal ^ at the start or a literal $ at the end of a regex, the character must be escaped.
(dot) metacharacter, and can match any single character (letter, digit, whitespace, everything). You may notice that this actually overrides the matching of the period character, so in order to specifically match a period, you need to escape the dot by using a slash \. accordingly.
Whenever you use a grep regular expression at the command prompt, surround it with quotes, or escape metacharacters (such as & ! . * $ ? and \ ) with a backslash ( \ ).
The backslash in a regular expression precedes a literal character. You also escape certain letters that represent common character classes, such as \w for a word character or \s for a space.
Take a look at PHP.JS's implementation of PHP's preg_quote function, that should do what you need:
http://phpjs.org/functions/preg_quote:491
The special regular expression characters are: . \ + * ? [ ^ ] $ ( ) { } = ! < > | : -
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