Regex to catch what user has put in text box

[robertkwild]

ok so got it working, may add more custom validators

from flask import Flask, render_template, request
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, DecimalField, RadioField, SelectField, TextAreaField, FileField, SubmitField
from wtforms.validators import InputRequired, Length, DataRequired, EqualTo, Regexp, ValidationError
import re

app = Flask(__name__)
app.config['SECRET_KEY'] = 'secretkey'


class PasswordForm(FlaskForm):
    un = StringField('Username', [InputRequired(message='please enter your Username')])
    op = PasswordField('Current Password', [InputRequired(message='please enter your current password')])
    np = PasswordField('New Password', [InputRequired(message='please enter your new password')])
    cnp = PasswordField('Confirm New Password')
    dom = SelectField('Domain', choices=[('lon-prod-dc01.domain.com', 'prod'), ('lon-corp-dc01.domain.com', 'corp')])
    
    def validate_np(form, field):
        if form.un.data:
            if field.data in form.un.data.split("."):
                raise ValidationError('New password cant contain firstname or lastname')
        if field.data == form.op.data:
            raise ValidationError('New password cant match Current password')
        if len(field.data) < 12:
            raise ValidationError('New password must be at least 12 characters')
        if not re.search(r"[0-9]", field.data):
            raise ValidationError('New password has to contain one number')
        if not re.search(r"[a-z]", field.data):
            raise ValidationError('New password has to contain one lower case character')
        if not re.search(r"[A-Z]", field.data):
            raise ValidationError('New password has to contain one upper case character')
        if not re.search(r"[\`\¬\!\"\£\$\%\^\&\*\(\)\-\_\=\+\\\|\[\]\;\'\#\,\.\/\{\}\:\@\~\<\>\?]", field.data):
            raise ValidationError('New password has to contain one special character')
        if not field.data == form.cnp.data:
            raise ValidationError('New password has to match Confirm new password')
        
    
@app.route('/password', methods=['GET', 'POST'])
def password():
    form = PasswordForm()
    if request.method == 'POST' and form.validate():
        return '<h1>The username is {}. The old password is {}. the new password is {}. changing for domain {}'.format(form.un.data, form.op.data, form.cnp.data, form.dom.data)
    return render_template('password.html', form=form)

if __name__ == '__main__':
    app.run(debug=True)

and front end

{% block content %}
    <h1>Change Password</h1>
    <form method="post" novalidate>
		{{form.hidden_tag()}}
		
		<p>{{ form.un.label }}</p>
		<p>{{ form.un}}</p>
		
		{% if form.un.errors %}
		<ul>
			{% for error in form.un.errors %}
			<li>
				{{error}}
			</li>
			{% endfor %}
		</ul>
		{% endif %}
		
		<p>{{ form.op.label }}</p>
		<p>{{ form.op}}</p>
		
		{% if form.op.errors %}
		<ul>
			{% for error in form.op.errors %}
			<li>
				{{error}}
			</li>
			{% endfor %}
		</ul>
		{% endif %}
		
		<p>{{ form.np.label }}</p>
		<p>{{ form.np}}</p>
		
		{% if form.np.errors %}
		<ul>
			{% for error in form.np.errors %}
			<li>
				{{error}}
			</li>
			{% endfor %}
		</ul>
		{% endif %}
		
		<p>{{ form.cnp.label }}</p>
		<p>{{ form.cnp}}</p>
		
		{% if form.cnp.errors %}
		<ul>
			{% for error in form.cnp.errors %}
			<li>
				{{error}}
			</li>
			{% endfor %}
		</ul>
		{% endif %}
		
		<p>{{ form.dom.label }}</p>
		<p>{{ form.dom}}</p>
		
		<input type="submit" value="Submit">
    </form>
{%endblock%}

but my problem now is it doesnt show all the errors same time on the front end for the user, only shows one error at a time when you hit submit