I need to my input field to obey these 2 expressions:
1 - /^[^.\?\\\/\:\*\<\>\|\"\']*[^\?\\\/\:\*\<\>\|\"\']*[^.\?\\\/\:\*\<\>\|\"\']+$/
2 - /^[^\s].*/
.Is there a way that can use these two expressions like:
Validators.pattern(/^[^.\?\\\/\:\*\<\>\|\"\']*[^\?\\\/\:\*\<\>\|\"\']*[^.\?\\\/\:\*\<\>\|\"\']+$/ && /^[^\s].*/)])]
You can compose multiple validators:
Validators.compose(
Validators.pattern('<pattern A>'),
Validators.pattern('<pattern B>'),
)
The /^[^.\?\\\/\:\*\<\>\|\"\']*[^\?\\\/\:\*\<\>\|\"\']*[^.\?\\\/\:\*\<\>\|\"\']+$/ can be written as /^[^.?\\\/:*<>|"']*[^?\\\/:*<>|"']*[^.?\\\/:*<>|"']+$/ if all unnecesary backslashes are removed.
Then, the /^[^\s].*/ regex just requires a string to start with a non-whitespace char.
So, all you need is to add a (?=\S) lookahead at the start:
Validators.pattern(/^(?=\S)[^.?\\\/:*<>|"']*[^?\\\/:*<>|"']*[^.?\\\/:*<>|"']+$/)
// ^^^^^^
See the regex demo.
It also seems too redundant to have two optional subpatterns at the start, see [^.?\\\/:*<>|"']*[^?\\\/:*<>|"']*. It makes sense to further shrink it to
Validators.pattern(/^(?=\S)[^?\\\/:*<>|"']*[^.?\\\/:*<>|"']+$/)
It matches
^ - start of string(?=\S) - a lookahead requiring the first char to be a char other than whitespace[^?\\\/:*<>|"']* - zero or more chars other than ?, \, /, :, *, <, >, |, " and '[^.?\\\/:*<>|"']+ - one or more chars other than ., ?, \, /, :, *, <, >, |, " and '$ - end of string.
^(?!.*\*)(?!.*\.$)and add your stuff to it.^(?!.*\*)means doesn't contain a*and(?!.*\.$)means doesn't end with.You can add your other rules the same way. It's a better way to validate lines even if the expressions can be combined somehow.