Check If first character is "+"

Question

How can i detect string is start with "+"

I tried
^\s*?\+.*$
but no help.

P.s: I have only one line alltime.

That should work fine, although the `?` is unnecessary. In fact, the `.*$` at the end is also unnecessary. You can test this yourself at https://regex101.com/ — r3mainer, Jun 18 '15 at 20:02
It is said it is [not possible](http://tasker.dinglisch.net/userguide/ru/matching.html). Wow. Looks like some wildcard, not a regex. — Wiktor Stribiżew, Jun 18 '15 at 20:06
`^\s*\+` working if I select "Matches Regex" as Condition Operator in Tasker. — Black White, Jun 18 '15 at 20:11

Federico Piazza · Accepted Answer · 2015-06-18T20:12:22.013

9

You don't need \s*?, you have to use:

^\+
or...
^[+]

In case you want to check a complete string, you can use:

^\+.*$

Working demo

edited Jun 18 '15 at 20:12

answered Jun 18 '15 at 20:06

Federico Piazza

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hkchakladar · Answer 2 · 2019-04-01T19:58:08.390

1

Without regex, you can also use native method startsWith().

So it would be:

var str1 = '+some text';
var bool = str1.startsWith('+'); //true

edited Apr 01 '19 at 19:58

answered Jan 23 '19 at 17:48

hkchakladar

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score 0 · Answer 3 · answered Jun 18 '15 at 20:10

0

^\+.*$ should work for your purposes.

Here's a fiddle with a couple test strings : https://regex101.com/r/nP2eL7/1

answered Jun 18 '15 at 20:10

X3074861X

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score 0 · Answer 4 · answered Mar 27 '20 at 06:11

0

Here's an optional (and optimal) solution in the case that the first character of your string happens to be either a + or - and you don't want the proceeding number to have any leading zeros:

/(?<=^\+|-|^)[1-9]\d*/

answered Mar 27 '20 at 06:11

Devin B.

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Check If first character is "+"

4 Answers4