For exmple I have a Text: Dear , We are happy to inform you that you got in . My actual text is much longer and I have to replace like 100 words with other words which are saved in another string. 2. Question I would like to have a regular expression that checks if a string contains only upper and lowercase letters, numbers, and underscores. In above string I have to check for "Mark", now I want to show all the strings which contains the word "Mark". I need to check if an input field on my page contains characters. that starts with certain character using jQuery 1. Method 2: Using Brute Force. Jquery check if table contains text Its value is 0 by default.. Set the string −. The \d character class is the simplest way to match numbers. check if string contains specific characters When we talk about JavaScript and jQuery both come with some built-in methods, which returns the position of the value in the array. jquery check if string contains specific character regex to check if string contains special characters javascript Code ... sadotech doorbell sounds ; facts management login. Method 2 – jQuery remove special characters from string.