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Javascript Regular Expresssion

Regular expressions is a powerful way of doing search and replace in any strings, a regular expression describes a pattern of characters.

Patterns and flags

Slashes "/" indicate JavaScript that we are starting a regular expression, just like quotes for strings.
var str = "WebTrainingRoom.Com is a eLearning Platform";
var wtrRegExp=/WebTrainingRoom/i

Modifiers
Modifier Description
i Perform case-insensitive matching
g Perform a global match (find all matches in given string rather than stopping after first match)
m Perform multiline matching


Brackets
Bracket is used for finding a range of characters:
Expression Description
[xyz] Find any character between the brackets
[^xyz] Find any character NOT between the brackets
[0-9] Find any character between the brackets (any digit)
[^0-9] Find any character NOT between the brackets (any non-digit)
(a|b) Find any of the alternatives specified
Methods of RegExp and String
str.search(reg)
str.match(reg)

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