Here you can find a relatively simple testing tool to evaluate javascript regular expressions.

And below there's a short reference on some regex formatting conventions as well.

RegEx Test Tool

Enter a RegEx:

global

ignore case

multiline

dot all (. matches \n)

Enter text to use as input for the test:

Enter a valid Regular Expression

Enter some input text

RegEx reference

Character classes

• [ABC] - character set
• [^ABC] - negated character set
• [A-Z] - range
• . - any character
• \s - any whitespace (tab, space)
• \S - not whitespace (tab, space)
• \w - any word
• \W - not a word
• \d - any digit
• \D - not a digit

Anchors

• ^ - beginning
• $ - end
• \b - word boundary
• \B - not word boundary

Escaped characters

• \xFF- hexadecimal escape
• \uFFFF - unicode escape
• \u{FFFF} - extended unicode escape
• \n - newline
• \r - carriage return
• \t - tab
• \v - vertical tab
• \f - form feed
• \0 - null