Special characters in regular expressions
Character implication
\ As a turn, that is, the characters usually after "\" are not interpreted in the original sense, such as the/b/matching character "B", when B is preceded by a backslash/\b/, to
Replace () is a simple replacement of characters.
ExampleCodeAs follows:
It only replaces the first letter. However, if you add a regular expression, the results will be different! Replace () supports regular expressions. It can match
The checksum is all made up of numbers
Funtin Isigit (s) {var patrn=/^[0-9]{1,20}$/; if (!patrn.x (s)) Rturn Fals Rturn Tru}
Javasript Form validation mail to determine whether an input is mailbox mail and implemented through regular expressions.
// Check whether it is composed of digits[Code] function isDigit (s) {var patrn =/^ [0-9] {1, 20} $/; if(! Patrn.exe c (s) return false return true} [/code]
// Check Logon Name: You can enter only 5-20 strings starting with a letter, which can
The regular expression of JSWhether the checksum is all made up of numbersCodefunction IsDigit (s){var patrn=/^[0-9]{1,20}$/;if (!patrn.exec (s)) return falsereturn True}Check login name: Only 5-20 entries begin with a letter, can be numbered, "_", "
Document directory
C {n}
C {m, n}
C {n ,}
*, + ,?
Greedy and non-greedy
Matching results of sub-regular expressions are not recorded
Forward pre-Query
?!
Global match, modifier g
Case-insensitive, modifier I
The end of the first line,
Http://www.jb51.net/article/25313.htmRegular expressions can:• Test a pattern for a string. For example, you can test an input string to see if there is a phone number pattern or a credit card number pattern in the string. This is called data
The regular expression is a regular expression. It seems that English is better understood than Chinese, that is, the regular expression is checked for non-conforming characters !! Regular expressions have a powerful and complex object RegExp, which
The regular expression is a regular expression. It seems that English is better understood than Chinese, that is, checking expression charactersNot compliant !! Regular expressions have a very powerful and complex object Regexp. In javascript1.2.Let'
On regular expressions, regular expressions
First, what is a regular expression?
Simply put: Regular expressions (Regular expression) is a language that handles string matching;
A regular expression describes a pattern of string matches that can be
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