i have this regex:
^https?:path\?id=([a-zA-Z0-9._]+)&?.*&gl=([^&|\n|\t\s]+)&?.*$
the query parameter:
?id=([a-zA-Z0-9._]+)&?.*&gl=([^&|\n|\t\s]+)&?.*$
how do i make "gl" to be optional?
You can use
^https?:path\?id=([^&]+)(?:.*?(?:&gl=([^&\s]+).*)?)?$
See the regex demo.
Details:
^ - start of stringhttp - a fixed http strings? - an optional s char:path\?id= - a fixed :path?id= string([^&]+) - Group 1: one or more chars other than a & char(?:.*?(?:&gl=([^&\s]+).*)?)? - an optional sequence of
.*? - any zero or more chars other than line break chars as few as possible(?:&gl=([^&\s]+).*)? - an optional sequence of
&gl= - a fixed string([^&\s]+) - Group 2: one or more chars other than whitespace and &.* - any zero or more chars other than line break chars as many as possible$ - end of string.