Simple javascript regex tester

RegEx Tester

Regexp:

Subject string:

Replacement text:

Result:

source : http://www.regular-expressions.info/javascriptexample.html
For Java RegEx Tester : http://www.regexplanet.com/advanced/java/index.html

Regex syntax

flags

• g - global match
• i - ignore case
• m - match over multiple lines

Escaping

• \ - special characters to literal and literal characters to special

Quantifiers

• ? - matches zero or one times
• * - matches zero or more times
• + - matches one or more times
• {n} - matches n times
• {n, m} - matches at least n times, but not more than m times

Anchors

• ^ - matches at the start of the line
• $ - matches at the end of the line
• \b - matches at the beginning or the end of a word

delimiter

• (?:x) - matches x not remember the match
• x(?=y) - matches x only if x is followed by y
• x(?!y) - matches x only if x is not followed by y

Character Escapes

• \s - matches whitespace
• \S - matches anything but a whitespace
• \f - matches a form-feed
• \n - matches a linefeed
• \r - matches a carriage return
• \t - matches a horizontal tab
• \v - matches vertical tab
• \d - matches any digit
• \D - matches anything except digit
• \w - matches any alphanumeric character including the underscore. Equivalent to [A-Za-z0-9_]
• \W - matches any non-word character. Equivalent to [^A-Za-z0-9_]

Others

• . - matches any character except a newline

Some predefined RegEx :

Positive Integers --- ^\d+$
Negative Integers --- ^-\d+$
Integer --- ^-{0,1}\d+$
Positive Number --- ^\d*\.{0,1}\d+$
Negative Number --- ^-\d*\.{0,1}\d+$
Positive Number or Negative Number - ^-{0,1}\d*\.{0,1}\d+$
Phone number --- ^\+?[\d\s]{3,}$
Phone with code --- ^\+?[\d\s]+\(?[\d\s]{10,}$
Year 1900-2099 --- ^(19|20)[\d]{2,2}$
Date (dd mm yyyy, d/m/yyyy, etc.) --- ^([1-9]|0[1-9]|[12][0-9]|3[01])\D([1-9]|0[1-9]|1[012])\D(19[0-9][0-9]|20[0-9][0-9])$
IP v4 --- ^(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]){3}$


Personal Name --- ^[\w\.\']{2,}([\s][\w\.\']{2,})+$
Username --- ^[\w\d\_\.]{4,}$
Password at least 6 symbols --- ^.{6,}$
Password or empty input --- ^.{6,}$|^$
email --- ^[\_]*([a-z0-9]+(\.|\_*)?)+@([a-z][a-z0-9\-]+(\.|\-*\.))+[a-z]{2,6}$
domain --- ^([a-z][a-z0-9\-]+(\.|\-*\.))+[a-z]{2,6}$


Match no input --- ^$
Match blank input --- ^[\s\t]*$
Match New line --- [\r\n]|$