javascript的正则表达式（Regular expression of JavaScript）.docVIP

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javascript的正则表达式（Regular expression of JavaScript）.doc

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javascript的正则表达式（Regular expression of JavaScript）

javascript的正则表达式（Regular expression of JavaScript） Create a regular expression The first method: Var reg = /pattern/; second methods: Var reg = new RegExp (pattern); exec regular expressions Grammar: Reg.exec (STR); STR is the target string to perform regular expressions. For example: script type= text/javascript Var reg = /test/; Var STR =testString; Var result = reg.exec (STR); Alert (result); /script will output test, because the regular expression will match reg str (testString) in the test substring and returns it. We use the following function to do regular exercises: Function execReg (reg, STR) { Var result = reg.exec (STR); Alert (result); } function accepts a regular expression parameter REG and a target string parameter STR, alert will be executed after regular expressions and string matching results. The above example is the test function: script type= text/javascript Function execReg (reg, STR) { Var result = reg.exec (STR); Alert (result); } Var reg = /test/; Var STR =testString; ExecReg (reg, STR); The example above /script with regular test in to match strings in the test, it is very boring, the same task can be completed by indexOf method. With the regular, it is natural to complete more powerful: A two piece three or four, fall not regular The above title translated into regular {1}, {2}, {3,4}, {1}. C{n} A {1} means. /c{1}/ can only match a C. /c{2}/ will match the two consecutive C. And so on, /c{n}/ will match n continuous C. See the example below: Reg = /c{1}/; Str=cainiao; ExecReg (reg, STR); return C Reg = /c{2}/; Str=cainiao; ExecReg (reg, STR); return null, said there is no match. Reg = /c{2}/; Str=ccVC jelly; ExecReg (reg, STR); return cc. C{m, n} C{3,4} mean, 3 C or 4 C continuous. for example Reg = /c{3,4}/; Str=ccVC jelly; ExecReg (reg, STR); return null, said there is no match. Reg = /c{3,4}/; Str=cccTest; ExecReg (reg, STR); return CCC results. Reg = /c{3,4}/; Str=ccccTest; ExecReg (reg, STR); the results returned CCCC, which indicat