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Testing Strings Against Regular Expressions
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regex_nametest(string_to_test);
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To test a regular expression against a string, you can use the test() method of the RegExp object The basic syntax is as follows:
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This syntax is similar to using a string method You replace regex_name with the name of the regular expression and replace string_to_test with a string or a string variable name For instance, look at the following example:
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var tomatch = /our/; tomatchtest("pour");
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This code will test the pour string against the regular expression named tomatch It doesn t use the result, though The test() method returns a Boolean value of true or false It returns true when any portion of the string matches the regular expression pattern Using the test() method, you can already write a short script, as shown here:
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The prompt gets a name from the viewer A regular expression is set up to see if the name entered will match it
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var thename = windowprompt("Enter your name",""); var tomatch = /John/; A variable is used to hold the var is_a_match = tomatchtest(thename); result of the test() method if (is_a_match) { If the result is true, windowalert("Wow, we have the same name!"); this alert appears } else { If the result is not true, windowalert("Not my name, but it will work!"); this alert appears }
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13: Handling Strings
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The prompt gathers a name and holds the value in a variable The pattern to match is John, and it is case sensitive Thus, only an entry containing John with a capital J followed by lowercase o, h, and n will create a match and return true when it is tested (though it could contain more than just John, so entries such as Johnny or John Doe would also return true if you want only a specific set of characters, you need to use some additional special characters, which will be discussed later in this section) The result of the test() method is assigned to a variable named is_a_match The variable is then used as the condition for the if statement If the variable holds a value of true, then the viewer gets the Wow, we have the same name! alert If it holds a value of false, the viewer gets the Not my name, but it will work! alert instead If you want to shorten the script, you can just make the result of the test() method the condition for the if statement (rather than create another variable), as in the following code:
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var thename = windowprompt("Enter your name",""); var tomatch = /John/; if (tomatchtest(thename)) { windowalert("Wow, we have the same name!"); } else { windowalert("Not my name, but it will work!"); }
The result of the test() method is used as the condition
Because the method returns true or false, it can be placed as the condition for the if statement on its own (You could make it (tomatchtest(thename)==true) if you wanted to, though)
Adding Flags
Flags allow you to make the match case insensitive or to look for every match in the string rather than just the first one (a global test) To add a flag, place it after the last slash in the regular expression You can use three options, as shown in Table 13-3 If you wanted to adjust the name script used previously to be case insensitive, you could add an i flag to the regular expression, as shown in the following code:
var thename= windowprompt("Enter your name",""); var tomatch=/John/i; if (tomatchtest(thename)) { windowalert("Wow, we have the same name!"); } else { windowalert("Not my name, but it will work!"); }
The i flag makes this regular expression case insensitive
Flag(s)
i g m
Purpose
Makes the match case insensitive Makes the match global Makes the match work in multiline mode
Table 13-3 Regular Expression Flags
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The test() method will now return true as long as the pattern of John is in the string It can be in any case, so now John, JOHN, john, and even JoHn are all matches and will cause the test() method to return true You can also use more than one flag or all three flags at once For example, if you want to have the match be both case insensitive and global (where it grabs each match in the entire string), you could use the following:
var tomatch=/John/ig;
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