[英]Regular expression for this?
How can I make a RegEx that matches something like these? 如何制作与此类匹配的RegEx?
"Hi hello world" and "Hi world"
I tried 我试过了
/^Hi (hello)? world$/i
But it doesn't work. 但这是行不通的。
/^Hi( hello)? world$/i
The space before hello
(or the one after) also needs to be optional, otherwise it matches either: hello
之前的空格(或之后的空格)也必须是可选的,否则它可以匹配:
hi__world
(the underscores are "spaces") hi__world
(下划线是“空格”) hi hello world
应该这样做:
/^Hi( | hello )world$/i
试试/^Hi (hello )?world$/i
,您的代码仅匹配“ Hi hello world”和“ Hi world”
Hi (\hello |)world
The pipe character works as "or." 竖线字符用作“或”。 So, the expression inside the parens matches either " hello" or nothing.
因此,parens中的表达式匹配“ hello”或不匹配。 You can test your Javascript regulare expressions here: http://rejex.heroku.com/
您可以在此处测试Javascript正则表达式: http : //rejex.heroku.com/
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