在字符串正则表达式中查找模式

Question

I need to find if some pattern is exist in the following string

I123456-sxzzukerrdco86rg-CMafApp-java

Or D977058-sxzzukerrdco86rg-CMafApp-java

I need to find the following

1. if string start with I977058-
2. The I can be also D like D977058-
3. the string should be find in the start of the string like I977058-sxzzukerrdco86rg-CMafApp-java , it cannot be in any other part of the string…
4. zzzz-sxzzukerrdco86rg-CMafApp-java is not valid
5. 11111-sxzzukerrdco86rg-CMafApp-java not valid

I try with the following which doesn't works

I don't know how to provide pattern which take also the D or I as starting point

var res = str.match(/I-/g);

Answer 1

不能完全清楚您要匹配的内容，但是以下模式将匹配任何以“ D”或“ I”开头的字符串-^字符表示字符串的开头。

var res = str.match(/^[ID]/);

Answer 2

You could check against the two letters and the wanted digits and a dash.

 console.log([ 'I123456-sxzzukerrdco86rg-CMafApp-java', 'D977058-sxzzukerrdco86rg-CMafApp-java', 'foo' ].map(/./.test.bind(/^[DI]\\d{6}-/))); 

Answer 3

/^[ID]\d+-sxzzukerrdco86rg-CMafApp-java/

http://www.regular-expressions.info/anchors.html

http://www.regular-expressions.info/charclass.html

Answer 4

Try something like that :

/^[ID]/

The '^' tells that it is the beginning of the word. [ID] => get a char in group {I,D}

You can use this website to train and understand regexpressions : https://regex101.com/