# Reg :regular expression **URL:** \ **Category:** Rails\ **Created:** [September 3, 2007, 3:34pm UTC](https://www.ruby-forum.com/t/reg-regular-expression/113654 "2007-09-03T15:34:12Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![shiva](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/85e7bf/32.png) [@shiva](https://www.ruby-forum.com/u/shiva)\ **Post date:** [September 3, 2007, 3:34pm UTC](https://www.ruby-forum.com/t/reg-regular-expression/113654/1 "2007-09-03T15:34:12Z")
Hi, Iam facing problem in excluding new line in reular expression…(/n) eg: shiva.grp\nhi da so it should exclude \n .if any one knows help me ---
**Author:** ![shiva](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/85e7bf/32.png) [@shiva](https://www.ruby-forum.com/u/shiva)\ **Post date:** [September 3, 2007, 8:14pm UTC](https://www.ruby-forum.com/t/reg-regular-expression/113654/2 "2007-09-03T20:14:39Z")
You’ll have to make the regexp multline with the /m option (i.e. /foo/ m) or it won’t match across newlines. Rein On Sep 3, 12:36 pm, Jamal S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![shiva](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/85e7bf/32.png) [@shiva](https://www.ruby-forum.com/u/shiva)\ **Post date:** [September 4, 2007, 8:38am UTC](https://www.ruby-forum.com/t/reg-regular-expression/113654/3 "2007-09-04T08:38:24Z")
Rein H. wrote: > You’ll have to make the regexp multline with the /m option (i.e. /foo/ > m) or it won’t match across newlines. > > Rein > > On Sep 3, 12:36 pm, Jamal S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) Thanks for your reply this is my regular expression my source is this mygroup.grp hi how r u iam fine str=~/^([a-zA-Z]{1}[a-zA-Z0-9]{0,}.([a-zA-Z]{1,}))\s(.\*)$/m if i put this regular expression it is not matching ---
**Author:** ![shiva](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/85e7bf/32.png) [@shiva](https://www.ruby-forum.com/u/shiva)\ **Post date:** [September 4, 2007, 9:27am UTC](https://www.ruby-forum.com/t/reg-regular-expression/113654/4 "2007-09-04T09:27:36Z")
I need to understand, you don’t want anything after new line? or you want to remove \n and use your regular expression? ---
**Author:** ![shiva](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/85e7bf/32.png) [@shiva](https://www.ruby-forum.com/u/shiva)\ **Post date:** [September 3, 2007, 7:36pm UTC](https://www.ruby-forum.com/t/reg-regular-expression/113654/5 "2007-09-03T19:36:38Z")
Shiva K. wrote: > Hi, > > Iam facing problem in excluding new line in reular expression…(/n) > eg: shiva.grp\nhi da so it should exclude \n .if any one knows help me Exclude you don’t want it? [^\n] something like that or ? ---
**Author:** ![shiva](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/85e7bf/32.png) [@shiva](https://www.ruby-forum.com/u/shiva)\ **Post date:** [September 4, 2007, 10:18am UTC](https://www.ruby-forum.com/t/reg-regular-expression/113654/6 "2007-09-04T10:18:01Z")
Jamal S. wrote: > I need to understand, you don’t want anything after new line? > > or you want to remove \n and use your regular expression? its like this eg: shiva.grp hi how r u eg: shiva.grp hi how r u both this format should accept ---
**Author:** ![shiva](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/85e7bf/32.png) [@shiva](https://www.ruby-forum.com/u/shiva)\ **Post date:** [September 4, 2007, 4:33pm UTC](https://www.ruby-forum.com/t/reg-regular-expression/113654/7 "2007-09-04T16:33:41Z")
Hi Shivan, I tried with this regex, it worked for both the example you mentioned. reg = /^[a-zA-Z]+.[a-zA-Z]+[a-zA-Z]+[\s]\*$/ str = two example values you specified. str =~ reg -----\> 0(output) On Sep 4, 1:18 pm, Shiva K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![shiva](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/85e7bf/32.png) [@shiva](https://www.ruby-forum.com/u/shiva)\ **Post date:** [September 5, 2007, 6:39am UTC](https://www.ruby-forum.com/t/reg-regular-expression/113654/8 "2007-09-05T06:39:05Z")
Matthew R. wrote: > raghukumar wrote: > > > Hi Shivan, > > I tried with this regex, it worked for both the example you mentioned. > > > > reg = /^[a-zA-Z]+.[a-zA-Z]+[a-zA-Z]+[\s]\*$/ > > > > str = two example values you specified. > > > > str =~ reg -----\> 0(output) > > > > On Sep 4, 1:18 pm, Shiva K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > > irb(main):001:0\> regexp = /^([a-zA-Z]\w\*.([a-zA-Z]+))\s(._)$/m > =\> /^([a-zA-Z]\w_.([a-zA-Z]+))\s(.\*)$/m > irb(main):002:0\> “mygroup.grp\nhi how r u\niam fine” =~ regexp > =\> 0 > irb(main):003:0\> $1 > =\> “mygroup.grp” > irb(main):004:0\> $2 > =\> “grp” > irb(main):005:0\> $3 > =\> “hi how r u\niam fine” thnaks man for your help (str=~/^([a-zA-Z]{1}[a-zA-Z0-9]{0,}.([a-zA-Z]{1,}))$/i) in the above expression it should not allow new line but it allowing inside pls help me…iam poor in regular expression ---
**Author:** ![shiva](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/85e7bf/32.png) [@shiva](https://www.ruby-forum.com/u/shiva)\ **Post date:** [September 4, 2007, 5:44pm UTC](https://www.ruby-forum.com/t/reg-regular-expression/113654/9 "2007-09-04T17:44:12Z")
raghukumar wrote: > Hi Shivan, > I tried with this regex, it worked for both the example you mentioned. > > reg = /^[a-zA-Z]+.[a-zA-Z]+[a-zA-Z]+[\s]\*$/ > > str = two example values you specified. > > str =~ reg -----\> 0(output) > > On Sep 4, 1:18 pm, Shiva K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) irb(main):001:0\> regexp = /^([a-zA-Z]\w\*.([a-zA-Z]+))\s(._)$/m =\> /^([a-zA-Z]\w_.([a-zA-Z]+))\s(.\*)$/m irb(main):002:0\> “mygroup.grp\nhi how r u\niam fine” =~ regexp =\> 0 irb(main):003:0\> $1 =\> “mygroup.grp” irb(main):004:0\> $2 =\> “grp” irb(main):005:0\> $3 =\> “hi how r u\niam fine”