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I have the following regex pattern and string:
var str="Is this all there is?";
var patt1=/is/gi;
I would like to just extract the main expression is (without the modifiers) from var patt1 using another regular expression, which we can call var patt2 for arguments sake.
How is this possible to do in vanilla JavaScript?
562
Using special characters For example, to match a single "a" followed by zero or more "b" s followed by "c" , you'd use the pattern /ab*c/ : the * after "b" means "0 or more occurrences of the preceding item."
RegExp Object A regular expression is a pattern of characters. The pattern is used to do pattern-matching "search-and-replace" functions on text. In JavaScript, a RegExp Object is a pattern with Properties and Methods.
A regex (regular expression) consists of a sequence of sub-expressions. In this example, [0-9] and + . The [...] , known as character class (or bracket list), encloses a list of characters. It matches any SINGLE character in the list.
Start of String or Line: ^ By default, the ^ anchor specifies that the following pattern must begin at the first character position of the string. If you use ^ with the RegexOptions. Multiline option (see Regular Expression Options), the match must occur at the beginning of each line.
Yes, patt1 is a regex object.
You could get the regex source by patt1.source.
> console.dir(patt1);
/is/gi
global: true
ignoreCase: true
lastIndex: 0
multiline: false
source: "is"
__proto__: /(?:)/
No need for a regular expression. Try this:
> patt1.source
"is"
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