正则表达式匹配第二个单词的开头字母

Question

Consider these names: sathya , subha , selvi, shalini and ashok selvam

I coded as ( 'firstname': new RegExp('^' + req.body[fieldName], 'i') ) which means, If i enter 's' in searchtext box, it will display all the name starts with 's'.

But in the name ashok selvam, second word is beginning with 's'. I want this name also to display when i entered 's' in searchtext box.

Which regular expression I have to use to get the result?

Answer 1

像这样的东西？

( 'firstname': new RegExp('(^' + req.body[fieldName] + ')|(.*\s+' + req.body[fieldName] + ')', 'i') )

Answer 2

You may use an alternaton non-capturing group (?:^|\\\\s) instead of a mere ^ :

new RegExp('(?:^|\\s)' + req.body[fieldName], 'i')

Now, the search will be performed at the start of string or after a whitespace.

If the search string may contain special chars, you may need to escape it:

new RegExp('(?:^|\\s)' + req.body[fieldName].replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&'), 'i')