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Single-line mode and multi-line pattern instance analysis in JS regular expressions _ Regular expressions

Source: Internet
Author: User
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This paper analyzes the Single-line mode and multiline pattern in JS regular expression. Share to everyone for your reference. Specifically as follows:

JS Regular expressions are not supported in Single-line mode. That is, you cannot take a piece of content (there is a newline), using a pattern modifier to deal with the whole piece of content as a line to deal with.
For regular multiline substitution, you need to add the/mg pattern enhancer.

Copy Code code as follows:
<script type= "Text/javascript" >
/ /Regular replacement link, Link has newline
Function T1 () {
 var con = document.getelementsbyname (' content ') [0].value;//content <a "" >.....</a>, but there are newline
 var reg =/<a[\s]+[\d\d]*<\/a>/g;//use [\d\d] or [\w\w] or [\s\s] To resolve a problem that cannot be wrapped
 alert (Con.replace (Reg, '----'));
}
//The ending number of each row is replaced with the # number---Multiline mode, add/m (end of each line) and/g (global match) pattern enhancer
Function t2 () {
 var con = document.gete Lementsbyname (' content ') [0].value;//writes several lines of text, each line ends with a number
 var reg =/\d+$/gm;
 alert (Con.replace (Reg, ' # '));
}
</script>
<body>
<textarea rows= "5" cols= "a" name= "content" &G t;</textarea><br/>
<button onclick= "T1 ();" > Regular replacement links (to be considered for line wrapping) </button><br/>
<button onclick= "T2 ();" > Regular multiple-line replacement </button><br/>
</body>

I hope this article is helpful to the regular expression learning.

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Related Keywords:
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