Ruby String Regex Replace

Method isn t a good fit because i need to take the returned occurrence and then manipulate it to come up with the value that will be used to replace it.

Ruby string regex replace.

Ruby s string scan method of course can be used to find all occurrences of the pattern but i m not sure how to replace the returned occurrences once i ve made the. Ruby regular expressions ruby regex for short help you find specific patterns inside strings with the intent of extracting data for further processing. Changing a section of a string ruby allows part of a string to be modified through the use of the method. Or thanks to steenslag you could use.

Modify the string on which they are called whereas the sub and gsub returns a new string leaving the original unmodified. Will be escaped since it s otherwise interpreted as any character. Ly the lowercase substring ly. Ruby program that uses gsub with regexp value quickly slowly or happily replace all word sending with ly with a string.

Replace patterns with a regular expression. As is often the case this is best explained through the use of an example. Value gsub w ly rep puts value output rep rep or rep regexp pattern w one or more word characters. S str gsub re map if you re stuck in 1 8 land then.

Replacing a single word is fine. Regexp quote your string for example. First you don t declare the type in ruby so you don t need the first string. Think about an email address with a ruby regex you can define what a valid email address looks like.

But what if you could replace a pattern. A year an email address a phone number etc. To replace a word in string you do. Re regexp new map keys map x regexp escape x join and finally gsub.

Two common use cases for regular expressions include validation parsing. But it s a pattern matching language. Remember to use a single quoted string unless you want regular string interpolation to kick in where backslash has a special meaning. To use this method simply pass through the string of characters to be replaced to the method and assign the new string.

In other words your program will be able to tell the difference between a valid invalid email address. The sub sub. S str gsub re m map m you need the regexp escape in there in case anything you want to replace has a special meaning within a regex.